Added codecov token in cleartext

.github/workflows/test-go-task.yml

@@ -92,11 +92,25 @@ jobs:
           GO_MODULE_PATH: ${{ matrix.module.path }}
         run: task go:test
 
+      # A token is used to avoid intermittent spurious job failures caused by rate limiting.
+      - name: Set up Codecov upload token
+        run: |
+          if [[ "${{ github.repository }}" == "arduino/pluggable-discovery-protocol-handler" ]]; then
+            # In order to avoid uploads of data from forks, only use the token for runs in this repo.
+            # Token is intentionally exposed.
+            # See: https://community.codecov.com/t/upload-issues-unable-to-locate-build-via-github-actions-api/3954
+            CODECOV_TOKEN="d2497f03-291d-4e0c-9d31-d94614ed7c16"
+          else
+            # codecov/codecov-action does unauthenticated upload if empty string is passed via the `token` input.
+            CODECOV_TOKEN=""
+          fi
+          echo "CODECOV_TOKEN=$CODECOV_TOKEN" >> "$GITHUB_ENV"
+
       - name: Send unit tests coverage to Codecov
         if: runner.os == 'Linux'
         uses: codecov/codecov-action@v3
         with:
+          token: ${{ env.CODECOV_TOKEN }}
           file: ${{ matrix.module.path }}coverage_unit.txt
           flags: ${{ matrix.module.codecov-flags }}
-          token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: ${{ github.repository == 'arduino/pluggable-discovery-protocol-handler' }}