ci: use run_id and strategy.job-index for build-devcontainer digest artifact name

Signed-off-by: Aaron Wislang <[email protected]>

Author: asw101

.github/workflows/build-devcontainer.yml

@@ -107,7 +107,7 @@ jobs:
       - name: Upload digests
         uses: actions/upload-artifact@v4
         with:
-          name: digests-${{ github.job }}-${{ github.run_id }}
+          name: digests-${{ github.run_id }}-${{ strategy.job-index }}
           path: /tmp/digests/*
           if-no-files-found: error
           retention-days: 1