Allow to run CI manually with a specific version of the core

.github/workflows/tests.yml

@@ -14,12 +14,23 @@ on:
       - 'doc/**'
       - '**.md'
   workflow_dispatch: # Allow triggering manually
+    inputs:
+      core_ref:
+        description: Use a specific version of the core for the workflow run. Defaults to master.
+        type: string
+        default: 'master'
+      wagon_dependency_ref:
+        description: Use a specific version of the wagon dependency for the workflow run. Defaults to master.
+        type: string
+        default: 'master'
 jobs:
   wagon_tests:
     uses: hitobito/hitobito/.github/workflows/wagon-tests.yml@master
     with:
       wagon_repository: ${{ github.event.repository.name }}
       wagon_dependency_repository: hitobito_youth
+      core_ref: ${{ inputs.core_ref }}
+      wagon_dependency_ref: ${{ inputs.wagon_dependency_ref }}
     secrets:
       HEARTBEAT_URL: ${{ secrets.HEARTBEAT_URL }}
       HEARTBEAT_TOKEN: ${{ secrets.HEARTBEAT_TOKEN }}