Skip duplicate downstream tests (#160)

Author: jishnub

.github/workflows/downstream.yml

@@ -10,7 +10,18 @@ on:
       - '.github/workflows/TagBot.yml'
 
 jobs:
+  pre_job:
+    # continue-on-error: true # Uncomment once integration is finished
+    runs-on: ubuntu-latest
+    # Map a step output to a job output
+    outputs:
+      should_skip: ${{ steps.skip_check.outputs.should_skip }}
+    steps:
+      - id: skip_check
+        uses: fkirc/skip-duplicate-actions@v5
   test:
+    needs: pre_job
+    if: needs.pre_job.outputs.should_skip != 'true'
     name: ${{ matrix.package.group }}/${{ matrix.package.repo }}/${{ matrix.julia-version }}
     runs-on: ${{ matrix.os }}
     strategy: