chore: add an RP/OP integration test (#238)

* rp/op integration test
do not error if OP does not provide a redirect
working, but with debugging
clean up, remove debugging
support go1.15
attempt to fix coverage calculation

* Update pkg/client/rp/integration_test.go

Co-authored-by: Livio Spring <livio.a@gmail.com>

Co-authored-by: Livio Spring <livio.a@gmail.com>

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
         uses: actions/setup-go@v3
         with:
           go-version: ${{ matrix.go }}
-      - run: go test -race -v -coverprofile=profile.cov ./pkg/...
+      - run: go test -race -v -coverprofile=profile.cov -coverpkg=github.com/zitadel/oidc/... ./pkg/...
       - uses: codecov/codecov-action@v3.1.1
         with:
           file: ./profile.cov