Add CI check that go.mod is up to date (#56)

* Add clean working dir test

* Also run after integration tests

* Run as separate step

* Add to build_and_test

.circleci/config.yml

@@ -2,6 +2,14 @@ version: 2.1
 orbs:
   codecov: codecov/[email protected]
 jobs:
+  check-dependencies:
+    docker:
+      - image: circleci/golang:1.12
+    steps:
+      - checkout
+      - run: go mod verify
+      - run: git diff --quiet && echo "Working directory clean" || (echo "Working directory not clean"; exit 1)
+
   unit-tests:
     docker:
       - image: circleci/golang:1.12
@@ -35,6 +43,7 @@ workflows:
   version: 2
   build_and_test:
     jobs:
+      - check-dependencies
       - unit-tests
       - integration-tests
   release: