ci(add-to-project): Add project URL for local triggers

.github/workflows/add-to-project.yml

@@ -17,12 +17,20 @@ on:
     types:
       - opened
 
+env:
+    # We use this workflow locally for hugrverse-actions issues.
+    # This variable detects whether we are running the workflow locally or via an external workflow_call.
+    #
+    # Github's terrible version of a 'ternary operator'
+    # https://github.com/actions/runner/issues/409#issuecomment-752775072
+    PROJECT_URL: ${{ github.repository == 'CQCL/hugrverse-actions' && 'https://github.com/orgs/CQCL-DEV/projects/10' || github.event.inputs.project-url }}
+
 jobs:
   add-to-project:
     name: Add issue to project
     runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
         with:
-          project-url: ${{ github.event.inputs.project-url }}
+          project-url: ${{ env.PROJECT_URL }}
           github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}