♻️ Switch penpot images to sha-<commit> tagging

Replaces the content-hash build key (bundle_version + docker/images tree hash) used to tag and dedupe the backend/frontend/exporter/storybook/mcp image set with sha-<commit>, matching the scheme already used by admin-console, licenses-manager and payments across the org. The check→build→promote pattern with the S3 marker is unchanged; only the key used for the marker, the immutable tag and the local bundle cache filename moves from the composite build key to the git commit sha (the bundle cache now keys on bundle_version alone, which is what it actually caches). devenv is intentionally left out of this pass, it has no versioned tagging today.

Signed-off-by: David Barragán Merino <david.barragan@kaleidos.net>

.github/workflows/build-docker.yml

@@ -41,7 +41,7 @@ jobs:
     outputs:
       gh_ref: ${{ steps.vars.outputs.gh_ref }}
       bundle_version: ${{ steps.vars.outputs.bundle_version }}
-      build_key: ${{ steps.vars.outputs.build_key }}
+      sha: ${{ steps.vars.outputs.sha }}
       exists: ${{ steps.check.outputs.exists }}
 
     steps:
@@ -59,6 +59,7 @@ jobs:
         run: |
           GH_REF="${{ inputs.gh_ref || github.ref_name }}"
           echo "gh_ref=$GH_REF" >> $GITHUB_OUTPUT
+          echo "sha=$(git rev-parse --short=12 HEAD)" >> $GITHUB_OUTPUT
 
           BUNDLE_VERSION=$(aws s3api head-object \
             --bucket ${{ secrets.S3_BUCKET }} \
@@ -67,15 +68,10 @@ jobs:
             --output text)
           echo "bundle_version=$BUNDLE_VERSION" >> $GITHUB_OUTPUT
 
-          # Image content = bundle + docker build context, so the build key
-          # combines both.
-          CTX_HASH=$(git rev-parse "HEAD:docker/images" | cut -c1-12)
-          echo "build_key=${BUNDLE_VERSION}-${CTX_HASH}" >> $GITHUB_OUTPUT
-
       # The image set is a single block, so a single set-level check is
       # enough: `promote` drops a marker object in S3 only after every
       # image was built AND every branch tag was moved. Marker present
-      # means there is nothing at all to do for this build key.
+      # means there is nothing at all to do for this commit.
       - name: Check if this image set is already built
         id: check
         env:
@@ -85,13 +81,13 @@ jobs:
         run: |
           if aws s3api head-object \
                --bucket ${{ secrets.S3_BUCKET }} \
-               --key "markers/images-${{ steps.vars.outputs.build_key }}" \
+               --key "markers/images-sha-${{ steps.vars.outputs.sha }}" \
                > /dev/null 2>&1; then
             echo "exists=true" >> $GITHUB_OUTPUT
             {
               echo "### ⏭️ Image set build skipped"
               echo ""
-              echo "The whole set was already built and promoted for \`${{ steps.vars.outputs.build_key }}\`."
+              echo "The whole set was already built and promoted for \`sha-${{ steps.vars.outputs.sha }}\`."
             } >> "$GITHUB_STEP_SUMMARY"
           else
             echo "exists=false" >> $GITHUB_OUTPUT
@@ -101,7 +97,7 @@ jobs:
             # prune stale bundles while at it.
             mkdir -p "$BUNDLE_CACHE"
             find "$BUNDLE_CACHE" -type f -mtime +1 -delete || true
-            ZIP="$BUNDLE_CACHE/penpot-${{ steps.vars.outputs.build_key }}.zip"
+            ZIP="$BUNDLE_CACHE/penpot-${{ steps.vars.outputs.bundle_version }}.zip"
             if [ ! -f "$ZIP" ]; then
               aws s3 cp "s3://${{ secrets.S3_BUCKET }}/penpot-${{ steps.vars.outputs.gh_ref }}.zip" "$ZIP.$$.tmp"
               mv "$ZIP.$$.tmp" "$ZIP"
@@ -173,7 +169,7 @@ jobs:
           AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
           AWS_DEFAULT_REGION: ${{ secrets.AWS_REGION }}
         run: |
-          ZIP="$BUNDLE_CACHE/penpot-${{ needs.prepare.outputs.build_key }}.zip"
+          ZIP="$BUNDLE_CACHE/penpot-${{ needs.prepare.outputs.bundle_version }}.zip"
           if [ ! -f "$ZIP" ]; then
             echo "Bundle not found in host cache; falling back to S3."
             mkdir -p "$BUNDLE_CACHE"
@@ -213,7 +209,7 @@ jobs:
           sbom: true
           # Immutable tag only; branch tags are moved atomically for the
           # whole image set by the `promote` job.
-          tags: ${{ secrets.DOCKER_REGISTRY }}/${{ matrix.image }}:build-${{ needs.prepare.outputs.build_key }}
+          tags: ${{ secrets.DOCKER_REGISTRY }}/${{ matrix.image }}:sha-${{ needs.prepare.outputs.sha }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=registry,ref=${{ secrets.DOCKER_REGISTRY }}/${{ matrix.image }}:buildcache
           cache-to: type=registry,ref=${{ secrets.DOCKER_REGISTRY }}/${{ matrix.image }}:buildcache,mode=max
@@ -249,7 +245,7 @@ jobs:
           for image in $ALL_IMAGES; do
             docker buildx imagetools create \
               -t "${{ secrets.DOCKER_REGISTRY }}/$image:${{ needs.prepare.outputs.gh_ref }}" \
-              "${{ secrets.DOCKER_REGISTRY }}/$image:build-${{ needs.prepare.outputs.build_key }}"
+              "${{ secrets.DOCKER_REGISTRY }}/$image:sha-${{ needs.prepare.outputs.sha }}"
           done
 
       # The marker is written LAST: its presence certifies that all five
@@ -261,11 +257,11 @@ jobs:
           AWS_DEFAULT_REGION: ${{ secrets.AWS_REGION }}
         run: |
           echo "${{ github.run_id }}" | aws s3 cp - \
-            "s3://${{ secrets.S3_BUCKET }}/markers/images-${{ needs.prepare.outputs.build_key }}"
+            "s3://${{ secrets.S3_BUCKET }}/markers/images-sha-${{ needs.prepare.outputs.sha }}"
           {
             echo "### ✅ Image set promoted"
             echo ""
-            echo "All \`:${{ needs.prepare.outputs.gh_ref }}\` tags now point to \`build-${{ needs.prepare.outputs.build_key }}\`."
+            echo "All \`:${{ needs.prepare.outputs.gh_ref }}\` tags now point to \`sha-${{ needs.prepare.outputs.sha }}\`."
           } >> "$GITHUB_STEP_SUMMARY"
 
   # ── 4. Single failure notification for the whole workflow ─────────────