ci: add multiple release-please PRs

.github/workflows/cd.yaml

@@ -16,6 +16,12 @@ jobs:
     permissions:
       contents: write
       pull-requests: write
+    strategy:
+      fail-fast: false
+      matrix:
+        base:
+          - php/7.4/fpm-nginx
+          - php/8.0/fpm-nginx
     outputs:
       tag_name: ${{ steps.release.outputs.tag_name }}
       release_created: ${{ steps.release.outputs.release_created }}
@@ -25,7 +31,7 @@ jobs:
         with:
           release-type: simple
           target-branch: ${{ github.ref_name }}
-          path: php/7.4/fpm-nginx
+          path: ${{ matrix.base }}
 
   orchestrator:
     name: Orchestrator