Merge pull request #182 from CosmosContracts/add_tidy_ci

Spike tidy CI action

.github/workflows/build.yml

@@ -15,6 +15,7 @@ jobs:
 
   test:
     runs-on: ubuntu-latest
+    name: test
     steps:
     - name: Install Go
       uses: actions/setup-go@v2
@@ -24,3 +25,23 @@ jobs:
       uses: actions/checkout@v2
     - name: Test
       run: go test ./...
+
+# Use --check or --exit-code when available (Go 1.19?)
+# https://github.com/golang/go/issues/27005
+  tidy:
+    runs-on: ubuntu-latest
+    name: tidy
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+      - run: |
+          go mod tidy
+          CHANGES_IN_REPO=$(git status --porcelain)
+          if [[ -n "$CHANGES_IN_REPO" ]]; then
+            echo "Repository is dirty. Showing 'git status' and 'git --no-pager diff' for debugging now:"
+            git status && git --no-pager diff
+            exit 1
+          fi