Build devhack-specific image

Author: mjsir911

.github/workflows/docker-publish.yml

@@ -116,3 +116,17 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
+
+      - name: Build and push /dev/hack Docker image
+        id: build-and-push-devhack
+        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:devhack
+          build-args: |
+            TRAC_INSTALL_URL=git+https://github.com/devhack-seattle/trac.git
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max