How to set create admin user?

I have Decidim with docker up and running (thanks for the repo).
However, when going to next steps in install, I am unable to create an admin user.
The suggested command bin/rails decidim_system:create_admin is not available.
In the container, the available rails commands don't include the create_admin command:
root@XXXXXXX:/code# bin/rails --tasks
rails about                                               # List versions of all Rails frameworks and the environment
rails active_storage:install                              # Copy over the migration needed to the application
rails app:template                                        # Applies the template supplied by LOCATION=(/path/to/template)...
rails app:update                                          # Update configs and some other initially generated files (or u...
rails assets:clean[keep]                                  # Remove old compiled assets
rails assets:clobber                                      # Remove compiled assets
rails assets:environment                                  # Load asset compile environment
rails assets:precompile                                   # Compile all the assets named in config.assets.precompile
rails autoprefixer:info                                   # Show selected browsers and prefixed CSS properties and values
rails cache_digests:dependencies                          # Lookup first-level dependencies for TEMPLATE (like messages/s...
rails cache_digests:nested_dependencies                   # Lookup nested dependencies for TEMPLATE (like messages/show o...
rails db:create                                           # Creates the database from DATABASE_URL or config/database.yml...
rails db:drop                                             # Drops the database from DATABASE_URL or config/database.yml f...
rails db:environment:set                                  # Set the environment value for the database
rails db:fixtures:load                                    # Loads fixtures into the current environment's database
rails db:migrate                                          # Migrate the database (options: VERSION=x, VERBOSE=false, SCOP...
rails db:migrate:status                                   # Display status of migrations
rails db:rollback                                         # Rolls the schema back to the previous version (specify steps ...
rails db:schema:cache:clear                               # Clears a db/schema_cache.yml file
rails db:schema:cache:dump                                # Creates a db/schema_cache.yml file
rails db:schema:dump                                      # Creates a db/schema.rb file that is portable against any DB s...
rails db:schema:load                                      # Loads a schema.rb file into the database
rails db:seed                                             # Loads the seed data from db/seeds.rb
rails db:setup                                            # Creates the database, loads the schema, and initializes with ...
rails db:structure:dump                                   # Dumps the database structure to db/structure.sql
rails db:structure:load                                   # Recreates the databases from the structure.sql file
rails db:version                                          # Retrieves the current schema version number
rails decidim:check_locales                               # Allows a decidim installation to check whether its locales ar...
rails decidim:check_users_newsletter_opt_in               # Check and notify users to update her newsletter notifications...
rails decidim:choose_target_plugins                       # Setup environment so that only decidim migrations are installed
rails decidim:delete_data_portability_files               # Deletes all data portability files previous to `Decidim.data_...
rails decidim:generate_external_development_app           # Generates a dummy app for trying out external modules
rails decidim:generate_external_test_app                  # Generates a dummy app for testing in external installations
rails decidim:install:migrations                          # Copy migrations from decidim to application
rails decidim:locales:rebuild_search                      # Rebuild the search index
rails decidim:locales:sync_all                            # Ensures locales in organizations are in sync with Decidim ini...
rails decidim:metrics:all[day]                            # Execute all metrics calculation methods
rails decidim:metrics:list                                # Show available metrics
rails decidim:metrics:one[metric,day]                     # Execute one metric calculation method
rails decidim:metrics:rebuild[metric,day]                 # Rebuild calculations from specific day
rails decidim:open_data:export                            # Generates the Open Data export files for each organization
rails decidim:right_to_be_forgotten                       # Deletes User records by ID using a CSV file
rails decidim:upgrade                                     # Install migrations from Decidim to the app
rails decidim_accountability:install:migrations           # Copy migrations from decidim_accountability to application
rails decidim_admin:install:migrations                    # Copy migrations from decidim_admin to application
rails decidim_assemblies:install:migrations               # Copy migrations from decidim_assemblies to application
rails decidim_blogs:install:migrations                    # Copy migrations from decidim_blogs to application
rails decidim_budgets:install:migrations                  # Copy migrations from decidim_budgets to application
rails decidim_comments:install:migrations                 # Copy migrations from decidim_comments to application
rails decidim_debates:install:migrations                  # Copy migrations from decidim_debates to application
rails decidim_forms:install:migrations                    # Copy migrations from decidim_forms to application
rails decidim_meetings:clean_registration_forms[months]   # Remove registration forms belonging to meetings that have end...
rails decidim_meetings:install:migrations                 # Copy migrations from decidim_meetings to application
rails decidim_pages:install:migrations                    # Copy migrations from decidim_pages to application
rails decidim_participatory_processes:install:migrations  # Copy migrations from decidim_participatory_processes to appli...
rails decidim_proposals:install:migrations                # Copy migrations from decidim_proposals to application
rails decidim_sortitions:install:migrations               # Copy migrations from decidim_sortitions to application
rails decidim_surveys:install:migrations                  # Copy migrations from decidim_surveys to application
rails decidim_surveys:migrate_data_to_decidim_forms       # Migrate data from decidim_surveys tables to decidim_forms tables
rails decidim_system:install:migrations                   # Copy migrations from decidim_system to application
rails decidim_verifications:install:migrations            # Copy migrations from decidim_verifications to application
rails dev:cache                                           # Toggle development mode caching on/off
rails geocode:all                                         # Geocode all objects without coordinates
rails geocoder:maxmind:geolite:download                   # Download MaxMind GeoLite City data
rails geocoder:maxmind:geolite:extract                    # Extract (unzip) MaxMind GeoLite City data
rails geocoder:maxmind:geolite:insert                     # Load/refresh MaxMind GeoLite City data
rails geocoder:maxmind:geolite:load                       # Download and load/refresh MaxMind GeoLite City data
rails initializers                                        # Print out all defined initializers in the order they are invo...
rails log:clear                                           # Truncates all/specified *.log files in log/ to zero bytes (sp...
rails middleware                                          # Prints out your Rack middleware stack
rails notes                                               # Enumerate all annotations (use notes:optimize, :fixme, :todo ...
rails notes:custom                                        # Enumerate a custom annotation, specify with ANNOTATION=CUSTOM
rails restart                                             # Restart app by touching tmp/restart.txt
rails routes                                              # Print out all defined routes in match order, with names
rails secret                                              # Generate a cryptographically secure secret key (this is typic...
rails stats                                               # Report code statistics (KLOCs, etc) from the application or e...
rails test                                                # Runs all tests in test folder except system ones
rails test:cells                                          # Run tests for cells
rails test:db                                             # Run tests quickly, but also reset db
rails test:system                                         # Run system tests only
rails time:zones[country_or_offset]                       # List all time zones, list by two-letter country code (`rails ...
rails tmp:clear                                           # Clear cache, socket and screenshot files from tmp/ (narrow w/...
rails tmp:create                                          # Creates tmp directories for cache, sockets, and pids
rails yarn:install                                        # Install all JavaScript dependencies as specified via Yarn
decidim / docker

How to set create admin user? #97
