Add Go modules to vendor directory

.github/workflows/main.yml

@@ -18,6 +18,9 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v2
 
+    - name: Check vendor
+      run: DOCKER_BUILDKIT=1 make check-vendor
+
     - name: Lint code
       run: DOCKER_BUILDKIT=1 make lint
 

Makefile

@@ -49,6 +49,10 @@ lint: build-validate-image
 check-license: build-validate-image
 	docker run --rm $(IMAGE_PREFIX)validate bash -c "./scripts/validate/fileheader"
 
+.PHONY: check-vendor
+check-vendor: build-validate-image
+	docker run --rm $(IMAGE_PREFIX)validate bash -c "./scripts/validate/vendor"
+
 .PHONY: help
 help:
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'

scripts/validate/vendor

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+#   Copyright The Compose Specification Authors.
+
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+
+#       http://www.apache.org/licenses/LICENSE-2.0
+
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+
+set -eu -o pipefail
+
+go mod tidy 2>/dev/null && go mod vendor 2>/dev/null
+
+status="$(git status --porcelain -- go.mod go.sum vendor 2>/dev/null)"
+diffs=$(echo "$status" | grep -v '^[RAD] ' || true)
+if [ "$diffs" ]; then
+    {
+        set +x
+        echo 'Unexpected vendor diff:'
+        echo
+        echo "$diffs"
+        echo
+    } >&2
+    exit 1
+fi