Add CI/CD workflows for automated testing

[Copilot]

Adds GitHub Actions workflows to automatically validate code changes through testing. Tests use testcontainers with pgvector and require sqlc code generation.

Workflows Added

• test.yml - Validates pull requests to main and develop
• push.yml - Validates pushes to main and develop

Pipeline Steps

Both workflows execute:

• Install sqlc and generate type-safe database code (sqlc generate --no-remote)
• Download Go dependencies with caching
• Verify application builds
• Run full test suite with testcontainers (PostgreSQL + pgvector)

Environment variables for tests are provided as workflow configuration:

env:
  SERVICE_DEBUG: true
  SERVICE_DBHOST: localhost
  SERVICE_DBPORT: 5432
  SERVICE_DBUSER: postgres
  SERVICE_DBPASSWORD: postgres
  SERVICE_DBNAME: postgres
  SERVICE_ADMINKEY: TestAdminKey123

Workflows support manual triggering via workflow_dispatch.

Original prompt

There are many testing functions and stubs available in the repo. Examine them and add CI/CD actions to run tests wherever you think this might be useful (validating pull requests, perhaps before accepting pushes etc.). Keep in mind that sqlc must eventually be run and that integration tests use testcontainers and require a pgvector container. They may also need dummy env values?

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[awagner-mainz]

Looks good to me. We'll see how it works.