TMP: Way to build olbase for testing PRs

.github/workflows/olbase.yaml

@@ -1,6 +1,9 @@
 name: olbase
 
 on:
+  pull_request:
+    branches:
+      - master
   schedule:
     - cron: '00 16 * * 2'
   workflow_dispatch:
@@ -28,10 +31,22 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Build and push
+      # If on master, use the latest tag, otherwise use the branch name
+      - name: Master Build and push
         uses: docker/build-push-action@v6
+        if: github.ref == 'refs/heads/master'
         with:
           context: "."
           file: "./docker/Dockerfile.olbase"
           tags: openlibrary/olbase:latest
           push: true
+
+      # If on a PR use the PR number
+      - name: Test PR Build and push
+        uses: docker/build-push-action@v6
+        if: github.event_name == 'pull_request'
+        with:
+          context: "."
+          file: "./docker/Dockerfile.olbase"
+          tags: openlibrary/olbase:pr-${{ github.event.number }}
+          push: true