Verify CI build consistency

Ensure CI pipelines thoroughly verify build outputs and maintain consistency across different build tools and configurations. This prevents broken builds from reaching contributors and ensures reliable deployment artifacts.

Key practices:

1. Cross-tool verification: When using multiple build tools (Maven, SBT), verify that both produce consistent, working artifacts
2. Proper build phases: Use correct Maven lifecycle phases (e.g., package test instead of just test) to ensure proper classpath resolution
3. Rigorous output testing: Test the actual distribution artifacts, not just intermediate build outputs

Example from Maven workflow:

# Ensure proper Maven phase ordering for integration tests
./build/mvn $MAVEN_CLI_OPTS -pl sql/connect/client/jvm,sql/connect/client/integration-tests,sql/connect/common,sql/connect/server package test -fae

This approach protects contributors’ daily development by catching build inconsistencies early and making it easier to identify offending commits when builds break.