switch from custom proxy to tailscale vpn (#339)

Author: tobiasehlert

.github/workflows/codecov.yml

@@ -16,11 +16,18 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Connect to Tailnet
+        uses: tailscale/github-action@v2
+        with:
+          args: --accept-dns=true
+          oauth-client-id: ${{ secrets.TS_OAUTH_CLIENT_ID }}
+          oauth-secret: ${{ secrets.TS_OAUTH_SECRET }}
+          tags: tag:github-runner
+          version: 1.62.1
+
       - 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@v4