ci: re-enable Dgraph integration test

.ci/integration.cloudbuild.yaml

@@ -350,23 +350,23 @@ steps:
           mssql \
           mssql
 
-  # - id: "dgraph"
-  #   name: golang:1
-  #   waitFor: ["compile-test-binary"]
-  #   entrypoint: /bin/bash
-  #   env:
-  #     - "GOPATH=/gopath"
-  #     - "DGRAPH_URL=$_DGRAPHURL"
-  #   volumes:
-  #     - name: "go"
-  #       path: "/gopath"
-  #   args:
-  #     - -c
-  #     - |
-  #       .ci/test_with_coverage.sh \
-  #         "Dgraph" \
-  #         dgraph \
-  #         dgraph
+  - id: "dgraph"
+    name: golang:1
+    waitFor: ["compile-test-binary"]
+    entrypoint: /bin/bash
+    env:
+      - "GOPATH=/gopath"
+      - "DGRAPH_URL=$_DGRAPHURL"
+    volumes:
+      - name: "go"
+        path: "/gopath"
+    args:
+      - -c
+      - |
+        .ci/test_with_coverage.sh \
+          "Dgraph" \
+          dgraph \
+          dgraph
 
   - id: "http"
     name: golang:1