Refactor

.github/workflows/provenance2.yaml

@@ -1,14 +1,18 @@
 name: Build Provenances
 
+# See https://docs.github.com/en/actions/learn-github-actions/workflow-syntax-for-github-actions#example-using-concurrency-to-cancel-any-in-progress-job-or-run
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 on:
   workflow_dispatch:
     inputs:
       build-config-path:
         required: true
         type: string
     secrets:
-      GCP_SERVICE_ACCOUNT_KEY_JSON:
-        required: true
+      GCP_SERVICE_ACCOUNT_KEY_JSON: ${{ secrets.GCP_SERVICE_ACCOUNT_KEY_JSON }}
 
 jobs:
   get_inputs: