Enable building contributed recipes in PRs (#2213)

* Enable building contributed recipes in PRs

* Add some steps

* Simplify contributed-recipes requirements

* Do not use github.event_name

* Make a variable required

* Better text

.github/workflows/contributed-recipes.yml

@@ -18,6 +18,13 @@ on:
       - "docs/using/recipe_code/**"
   workflow_dispatch:
   workflow_call:
+    inputs:
+      # There is no good way to detect if the workflow was called using workflow_call
+      # https://github.com/actions/runner/discussions/1884
+      called-using-workflow-call:
+        description: "Was the workflow called using workflow_call"
+        required: true
+        type: boolean
 
 jobs:
   generate-matrix:
@@ -44,7 +51,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Load image to Docker 📥
-        if: ${{ github.event_name == 'workflow_call' && matrix.parent-image != '' }}
+        if: ${{ inputs.called-using-workflow-call && matrix.parent-image != '' }}
         uses: ./.github/actions/load-image
         with:
           image: ${{ matrix.parent-image }}

.github/workflows/docker.yml

@@ -494,5 +494,10 @@ jobs:
 
   contributed-recipes:
     uses: ./.github/workflows/contributed-recipes.yml
-    needs: [merge-tags]
-    if: github.ref == 'refs/heads/main' || github.event_name == 'schedule'
+    with:
+      called-using-workflow-call: true
+    # Contributed recipes only use these images
+    # If recipes using other images will be added, they should be added here as well
+    #
+    # contributed-recipes will give an error if the image is not yet built and uploaded
+    needs: [aarch64-base, x86_64-base, aarch64-minimal, x86_64-minimal]