Set array in earlier job using JSON

.github/workflows/pr-annotate-with-flake8.yml

@@ -11,12 +11,21 @@ on:
     branches: [ develop ]
 
 jobs:
+  set_allowed:
+    runs-on: ubuntu-18.04
+    outputs:
+      matrix: ${{ steps.set-allowed.outputs.allowed }}
+    steps:
+    - id: set-allowed
+      run: echo "::set-output name=allowed::{['Athanasius']}"
+
   flake8_annotate:
     runs-on: ubuntu-18.04
+    needs: set_allowed
 
     steps:
       - name: Checkout
-        if: ${{ contains(['Athanasius'], github.actor) }}
+        if: ${{ contains(${{fromJson(needs.set_allowed.outputs.allowed)}}, github.actor) }}
         uses: actions/checkout@v2
         with:
           fetch-depth: 0