Revert "cleanup, ready to merge if passing"

This reverts commit 240e8f9.

Author: ylebre

.github/workflows/solid-tests-suites.yml

@@ -1,10 +1,14 @@
 ---
 name: Solid Test Suites
 
+env:
+  # Docker Hub digest (i.e. hash) of the used Docker Images that do not have a version tag.
+  PUBSUB_TAG: latest@sha256:b73a2a5c98d2005bb667dfc69d1c859d704366024298b9caa24ea2e182c456c2
+
 on:
   push:
     branches:
-      - main
+      - workflow
   pull_request:
     branches: [ main ]
   # Allow manually triggering the workflow.
@@ -25,6 +29,21 @@ jobs:
       fail-fast: false
 
     steps:
+      - name: Create docker tag from git reference
+        # A tag name may only contain lower- and uppercase letters, digits, underscores, periods and dashes.
+        run: |
+          echo "TAG=$(echo -n "${{ github.ref_name }}" \
+            | tr --complement --squeeze-repeats '[:alnum:]._-' '_')" \
+            >> "${GITHUB_ENV}"
+
+      - uses: actions/checkout@v4
+
+      - uses: actions/cache@v4
+        id: cache-solid-php-docker
+        with:
+          path: cache/solid-php
+          key: solid-php-docker-${{ github.sha }}
+
       - uses: docker/login-action@v3
         with:
           registry: ghcr.io