db:create - add support for --version

[krallin]

This allows customers to specify a specific Database Image (i.e. version) when creating a new Database via the CLI.

The db:images command also allows listing available Database Images.

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This builds upon #241, for the db:images command.

See https://github.com/aptible/api.aptible.com/pull/582 for the backend changes

Post release, we should make sure to update the documentation for db:create to reference db:images.

cc @fancyremarker @UserNotFound

[codecov-io]

Codecov Report

Merging #243 into master will increase coverage by 0.07%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #243      +/-   ##
==========================================
+ Coverage   96.84%   96.91%   +0.07%     
==========================================
  Files          80       81       +1     
  Lines        3332     3409      +77     
==========================================
+ Hits         3227     3304      +77     
  Misses        105      105

Impacted Files	Coverage Δ
spec/fabricators/operation_fabricator.rb	100% <100%> (ø)	:arrow_up:
lib/aptible/cli/subcommands/db.rb	91.44% <100%> (+1.37%)	:arrow_up:
spec/fabricators/database_image_fabricator.rb	100% <100%> (ø)
lib/aptible/cli/helpers/database.rb	77.21% <100%> (+2.92%)	:arrow_up:
spec/aptible/cli/subcommands/db_spec.rb	100% <100%> (ø)	:arrow_up:

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[krallin]

One question I'm wondering about is whether we should name the list command db:images or db:versions. I'm leaning towards db:versions (since the parameter is called --version in db:create). What do you think @fancyremarker @UserNotFound ?

[krallin]

Thanks! Went with db:versions.