Ensure we always build from vendored deps, and test for mod tidy

.circleci/config.yml

@@ -15,6 +15,18 @@ jobs:
           name: Test
           command: |
             make test
+      - run:
+          name: Check modules are tidy and checked in
+          command: |
+            export GO111MODULE=on
+            go mod tidy
+            go mod vendor
+            if [ "$(git status --porcelain)" != "" ]; then
+              echo "git tree is dirty after tidying and vendoring modules"
+              echo "ensure go.mod and go.sum are tidy and vendor is checked in"
+              git status
+              exit 1
+            fi
 
   dist-linux:
     docker:

.gitignore

@@ -1,6 +1,5 @@
 *~
 *.sw[a-z]
-vendor/*/
 dist/
 packagecloud.conf.json
 aws-okta

Makefile

@@ -19,9 +19,9 @@ dist/:
 	mkdir -p dist
 
 dist/aws-okta-$(VERSION)-darwin-amd64: | dist/
-	GOOS=darwin GOARCH=amd64 GO111MODULE=on go build $(LDFLAGS) -o $@
+	GOOS=darwin GOARCH=amd64 GO111MODULE=on go build -mod=vendor $(LDFLAGS) -o $@
 
 dist/aws-okta-$(VERSION)-linux-amd64: | dist/
-	GOOS=linux GOARCH=amd64 GO111MODULE=on go build $(LDFLAGS) -o $@
+	GOOS=linux GOARCH=amd64 GO111MODULE=on go build -mod=vendor $(LDFLAGS) -o $@
 
 .PHONY: clean all