Try automating getting previous run-id

Author: flufflycthu1u

.github/workflows/vartest.yml

@@ -15,6 +15,14 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
+      - name: Get Previous Run ID
+        id: get_id
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          # Fetches the ID of the last completed run for the current workflow
+          PREVIOUS_RUN_ID=$(gh run list --workflow "${{ github.workflow }}" --status completed --limit 1 --json databaseId --jq '.[0].databaseId')
+          echo "previous_run_id=$PREVIOUS_RUN_ID" >> $GITHUB_OUTPUT
       - name: Download test artifact
         uses: actions/download-artifact@v8
         with: