Update all action refs to use pinned commit SHAs instead of floating tags:
- actions/checkout: @v6 → @8e8c483 (v4)
- actions/setup-go: @v6 → @0c52d54 (v5)
- actions/upload-artifact: @v6 → @65d8626 (v4)
Pinned SHAs improve reproducibility and reduce supply chain risk by
preventing accidental or malicious changes in action releases. Aligns
with repository conventions used in other workflows (e.g., go.yml).
The workflow was failing because it was running inside 'weed' directory,
but the tests are at the repository root. Removed working-directory
default and updated relative paths to weed source.
- Create new workflow for S3 Tables integration testing
- Add build verification job for s3tables package and s3api integration
- Add format checking for S3 Tables code
- Add go vet checks for code quality
- Workflow runs on all pull requests
- Includes test output logging and artifact upload on failure
