adds support for a mysql backend for the pet store application
adds a DB_PLATFORM environment variable in the data source configuration - it is used in the DDL or DML scripts (such as schema-${platform}.sql or data-${platform}.sql)
refactors the build to use multi-stage builds instead of separate steps
adds a test script which ensures both mysql and postgres work as expected. it's a smoke test really. it's pretty simple and will result in a pass or fail
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Connected to #10
This PR:
Confirm by inspecting the changes and ensuring the build is green