fix: add CHARON_ENCRYPTION_KEY environment variable to benchmark and quality check workflows

.github/workflows/codecov-upload.yml

@@ -54,6 +54,7 @@ jobs:
         working-directory: ${{ github.workspace }}
         env:
           CGO_ENABLED: 1
+          CHARON_ENCRYPTION_KEY: ${{ secrets.CHARON_ENCRYPTION_KEY_TEST }}
         run: |
           bash scripts/go-test-coverage.sh 2>&1 | tee backend/test-output.txt
           exit "${PIPESTATUS[0]}"