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Skip building Ruby images that already exist #4

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Skip building Ruby images that already exist #4

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c86ab88
Skip building Ruby images that already exist in GHCR
baelter Mar 23, 2026
b51e967
Guard inputs.force for non-dispatch events, always build on PRs
baelter Mar 23, 2026
9578f34
Only trigger PR builds on Dockerfile changes
baelter Mar 23, 2026
5f6b520
Detect Dockerfile changes to decide when to rebuild all versions
baelter Mar 23, 2026
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31 changes: 30 additions & 1 deletion .github/workflows/ruby.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,11 @@ on:
- ruby/Dockerfile
- .github/workflows/ruby.yml
workflow_dispatch:
inputs:
force:
description: Rebuild all images
type: boolean
default: false

env:
REGISTRY: ghcr.io
Expand All @@ -37,14 +42,38 @@ jobs:

- uses: docker/setup-buildx-action@v4

- name: Check if Dockerfile changed
id: dockerfile
run: |
if [ "${{ github.event_name }}" = "pull_request" ]; then
BASE="${{ github.event.pull_request.base.sha }}"
else
BASE="${{ github.event.before }}"
fi
if git diff --name-only "$BASE" "${{ github.sha }}" -- ruby/Dockerfile | grep -q .; then
echo "changed=true" >> "$GITHUB_OUTPUT"
else
echo "changed=false" >> "$GITHUB_OUTPUT"
fi

- name: Check if image exists
id: check
run: |
if docker buildx imagetools inspect "${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.ruby-version }}" >/dev/null 2>&1; then
echo "exists=true" >> "$GITHUB_OUTPUT"
else
echo "exists=false" >> "$GITHUB_OUTPUT"
fi

- uses: docker/login-action@v4
if: github.event_name != 'pull_request'
if: github.event_name != 'pull_request' && (steps.check.outputs.exists != 'true' || steps.dockerfile.outputs.changed == 'true' || (github.event_name == 'workflow_dispatch' && inputs.force))
with:
registry: ${{ env.REGISTRY }}
username: ${{ github.actor }}
password: ${{ secrets.GITHUB_TOKEN }}

- uses: docker/build-push-action@v7
if: steps.check.outputs.exists != 'true' || steps.dockerfile.outputs.changed == 'true' || (github.event_name == 'workflow_dispatch' && inputs.force)
with:
context: ruby
platforms: linux/amd64,linux/arm64
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