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Fix Docker Hub workflow when secrets are unset
Use an explicit credentials check step and gate publish steps so the workflow exits successfully with a notice when Docker Hub secrets are not configured.
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.github/workflows/docker-publish-dockerhub.yml
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.github/workflows/docker-publish-dockerhub.yml
···
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jobs:
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publish:
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if: ${{ secrets.DOCKERHUB_USERNAME != '' && secrets.DOCKERHUB_TOKEN != '' }}
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runs-on: ubuntu-latest
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steps:
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- name: Check Docker Hub credentials
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id: creds
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env:
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DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
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DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
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run: |
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if [ -z "$DOCKERHUB_USERNAME" ] || [ -z "$DOCKERHUB_TOKEN" ]; then
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echo "enabled=false" >> "$GITHUB_OUTPUT"
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echo "::notice::Skipping Docker Hub publish because DOCKERHUB_USERNAME/DOCKERHUB_TOKEN are not set."
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else
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echo "enabled=true" >> "$GITHUB_OUTPUT"
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fi
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- name: Checkout
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if: steps.creds.outputs.enabled == 'true'
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uses: actions/checkout@v4
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- name: Set up QEMU
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if: steps.creds.outputs.enabled == 'true'
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uses: docker/setup-qemu-action@v3
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- name: Set up Docker Buildx
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if: steps.creds.outputs.enabled == 'true'
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uses: docker/setup-buildx-action@v3
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- name: Log in to Docker Hub
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if: steps.creds.outputs.enabled == 'true'
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uses: docker/login-action@v3
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_TOKEN }}
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- name: Extract Docker metadata
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if: steps.creds.outputs.enabled == 'true'
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id: meta
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uses: docker/metadata-action@v5
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with:
···
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type=sha,prefix=sha-
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- name: Build and push
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if: steps.creds.outputs.enabled == 'true'
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uses: docker/build-push-action@v6
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with:
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context: .