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fix: derive Docker image branch tags from workflow event context #268

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fix: derive Docker image branch tags from workflow event context #268

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b042588
fix docker workflow branch tagging
Copilot Jul 19, 2026
116bf63
harden docker workflow env handling
Copilot Jul 19, 2026
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20 changes: 13 additions & 7 deletions .github/workflows/docker.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ jobs:
uses: actions/checkout@v4
with:
fetch-depth: 0
ref: ${{ github.ref }}
ref: ${{ github.event.workflow_run.head_sha || github.sha }}

- name: Install python
uses: actions/setup-python@v5
Expand Down Expand Up @@ -63,13 +63,19 @@ jobs:
password: ${{ secrets.GITHUB_TOKEN }}

- name: Get git branch and short sha for tag
env:
EVENT_BRANCH: ${{ github.event.workflow_run.head_branch || github.ref_name }}
EVENT_SHA: ${{ github.event.workflow_run.head_sha || github.sha }}
run: |
git_hash_short=$(git rev-parse --short "$GITHUB_SHA")
echo "GIT_HASH_SHORT=${git_hash_short}" >> $GITHUB_ENV
git_branch=$(git branch -r --contains ${{ github.ref }} --merged ${{ github.ref }} --format "%(refname:lstrip=3)" | grep -v HEAD)
echo "GIT_BRANCH=${git_branch}" >> $GITHUB_ENV
git_branch_docker_safe=$(echo ${git_branch} | tr / -)
echo "GIT_BRANCH_DOCKER_SAFE=${git_branch_docker_safe}" >> $GITHUB_ENV
git_hash_short=$(git rev-parse --short "$EVENT_SHA")
printf 'GIT_HASH_SHORT=%s\n' "${git_hash_short}" >> "$GITHUB_ENV"
git_branch="$EVENT_BRANCH"
if [[ -z "${git_branch}" ]]; then
git_branch=$(git rev-parse --abbrev-ref HEAD)
fi
printf 'GIT_BRANCH=%s\n' "${git_branch}" >> "$GITHUB_ENV"
git_branch_docker_safe=$(echo "${git_branch}" | tr / -)
printf 'GIT_BRANCH_DOCKER_SAFE=%s\n' "${git_branch_docker_safe}" >> "$GITHUB_ENV"

# Tagging documented at: https://github.com/docker/metadata-action?tab=readme-ov-file#basic
- name: Extract metadata (tags, labels) for Docker
Expand Down
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