ci: add AWS artifact and database workflow

[leapfrog-bot]

Adds a GitHub Actions workflow for:

• push/PR/manual CI execution
• build, lint, test coverage
• npm package tarball creation
• GitHub Actions artifact upload
• AWS authentication via OIDC role or access key fallback
• S3 artifact push
• optional AWS CodeArtifact publish
• database connectivity probe for PostgreSQL, MySQL/MariaDB and MSSQL

Required repository/environment secrets:

AWS_REGION
AWS_ROLE_TO_ASSUME or AWS_ACCESS_KEY_ID + AWS_SECRET_ACCESS_KEY
AWS_S3_ARTIFACT_BUCKET
AWS_CODEARTIFACT_DOMAIN
AWS_CODEARTIFACT_DOMAIN_OWNER
AWS_CODEARTIFACT_REPOSITORY
DB_TYPE
DB_HOST
DB_PORT
DB_NAME
DB_USER
DB_PASSWORD
DB_SSL

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.66%. Comparing base (70ca69b) to head (4a6e4e8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #280   +/-   ##
=======================================
  Coverage   34.66%   34.66%           
=======================================
  Files          33       33           
  Lines         874      874           
  Branches      120      120           
=======================================
  Hits          303      303           
  Misses        567      567           
  Partials        4        4           

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