Split build and pr test build to allow building with rechunk on github

.github/workflows/build-pr-test.yml

@@ -0,0 +1,36 @@
+name: bluebuild test pr
+on:
+  pull_request:
+  workflow_dispatch: # allow manually triggering builds
+concurrency:
+  # only run one build at a time
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+jobs:
+  bluebuild:
+    name: Build Custom Image
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+    strategy:
+      fail-fast: false # stop GH from cancelling all matrix builds if one fails
+      matrix:
+        recipe:
+          # !! Add your recipes here
+          - recipe.yml
+    steps:
+      
+      # the build is fully handled by the reusable github action
+      - name: Build Custom Image
+        uses: blue-build/github-action@v1.8
+        with:
+          recipe: ${{ matrix.recipe }}
+          cosign_private_key: ${{ secrets.SIGNING_SECRET }}
+          registry: 'git.hydrosaber.com'
+          registry_token: ${{ secrets.PACKAGE_BUILDER_TOKEN }}
+          pr_event_number: ${{ github.event.number }}
+
+          # enabled by default, disable if your image is small and you want faster builds
+          maximize_build_space: true