adding proxy to codecov pipeline

Author: tobiasehlert

.github/workflows/codecov.yml

@@ -19,6 +19,8 @@ jobs:
       - name: Runing tests for coverage
         run: |
           go test -race -coverprofile=coverage.out -covermode=atomic `go list ./... | grep -v vendor/` -v
+        env:
+          TIBIADATA_PROXY: ${{ secrets.TIBIADATA_PROXY }}
 
       - name: Uploading coverage to Codecov
         uses: codecov/codecov-action@v3