gaborgsomogyi opened a new pull request, #240:
URL: https://github.com/apache/flink-docker/pull/240
## Summary
Adds automated Docker image building workflow and improves GPG keyserver
reliability.
## Changes
### 1. New GitHub Actions Workflow (`.github/workflows/docker_push.yml`)
- Builds all 9 Docker images (Flink 1.20/2.0/2.1 with Java 8/11/17/21) on
push to `master` and `dev-*` branches
- Pushes to GHCR (`ghcr.io/{owner}/flink-docker`) with multi-platform
support (amd64, arm64)
- Automatically extracts version from Dockerfiles for tagging
- Enables testing on forks (adapts to repository owner)
### 2. Updated GPG Keyservers in All Dockerfiles
- Replaced deprecated `ha.pool.sks-keyservers.net` with modern
`hkps://keys.openpgp.org`
- Affects both gosu and Flink tarball verification in all 9 Dockerfiles
- Fixes unreliable GPG key fetching that caused build failures
### 3. Reimplemented `publish-to-dockerhub.sh`
- Now uses `crane` to copy images from GHCR → Docker Hub (instead of local
builds)
- 10x faster: ~10 minutes vs ~2 hours
- Platform independent, preserves multi-arch images automatically
- Adds interactive confirmation prompt before publishing
- Follows same pattern as flink-kubernetes-operator
## Benefits
- **Automated releases**: Images automatically built and available in GHCR
on merge
- **Faster publishing**: PMC members can copy to Docker Hub in minutes
- **More reliable**: Modern keyservers prevent GPG verification failures
- **Better testing**: Fork-friendly workflow enables testing before Apache
repo
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