Build the Container Image for Every Commit

To improve CI reliability and catch integration issues early, we should build the container image for every commit pushed to the main branch . This ensures that:

- Our image build process remains functional.
- All committed code can be built and deployed without manual intervention.
- Future deployment issues are caught during CI, not post-merge.

### what we need

- A GitHub Actions workflow is triggered on every commit or PR push.
- The workflow builds the container image using the latest commit.
- Optionally, the image is pushed to a staging registry or cached for further tests.
- Failures in the image build should block the commit/PR from merging.