Provide expected Docker image build args in the Publish workflow.

.github/workflows/publish.yml

@@ -44,6 +44,12 @@ jobs:
     - name: Check out code
       uses: actions/checkout@v5
 
+    - name: Get commit timestamp
+      run: echo "COMMIT_TIMESTAMP=$(git show -s --format=%ci HEAD)" >> $GITHUB_ENV
+
+    - name: Get commit short SHA
+      run: echo "COMMIT_SHORT_SHA=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
+
     - name: Log in to Docker Hub
       uses: docker/login-action@v3
       with:
@@ -72,6 +78,12 @@ jobs:
         context: .
         file: ${{ matrix.image.dockerfile }}
         platforms: linux/arm64,linux/amd64
+        # TODO: clean up build arg and environment variable naming.
+        build-args: |
+          CI_COMMIT_BRANCH=${{ github.ref_name }}
+          CI_COMMIT_SHA=${{ github.sha }}
+          CI_COMMIT_SHORT_SHA=${{ env.COMMIT_SHORT_SHA }}
+          CI_COMMIT_TIMESTAMP=${{ env.COMMIT_TIMESTAMP }}
         tags: ${{ steps.meta.outputs.tags }}
         labels: ${{ steps.meta.outputs.labels }}
         provenance: true