vendor and use vendor in windows image builds

Makefile

@@ -648,13 +648,13 @@ COVER_PKG ?= .
 test-all: ## run all unit tests.
 	@$(eval COVER_FILTER=`go list --tags ignore_uncovered,ignore_autogenerated $(COVER_PKG)/... | tr '\n' ','`)
 	@echo Test coverpkg: $(COVER_FILTER)
-	go test -buildvcs=false -tags "unit" -coverpkg=$(COVER_FILTER) -race -covermode atomic -failfast -coverprofile=coverage.out $(COVER_PKG)/...
+	go test -mod=readonly -buildvcs=false -tags "unit" -coverpkg=$(COVER_FILTER) -race -covermode atomic -failfast -coverprofile=coverage.out $(COVER_PKG)/...
 
 
 test-integration: ## run all integration tests.
 	CNI_DROPGZ_VERSION=$(CNI_DROPGZ_VERSION) \
 		CNS_VERSION=$(CNS_VERSION) \
-		go test -buildvcs=false -timeout 1h -coverpkg=./... -race -covermode atomic -coverprofile=coverage.out -tags=integration ./test/integration...
+		go test -mod=readonly -buildvcs=false -timeout 1h -coverpkg=./... -race -covermode atomic -coverprofile=coverage.out -tags=integration ./test/integration...
 
 test-cyclonus: ## run the cyclonus test for npm.
 	cd test/cyclonus && bash ./test-cyclonus.sh

cns/windows.Dockerfile

@@ -12,7 +12,7 @@ RUN mkdir /usr/bin/
 COPY . .
 
 # Build cns
-RUN $Env:CGO_ENABLED=0; go build -v -o /usr/bin/azure-cns.exe -ldflags """-X main.version=${env:VERSION} -X ${env:CNS_AI_PATH}=${env:CNS_AI_ID}""" -gcflags="-dwarflocationlists=true" ./cns/service
+RUN $Env:CGO_ENABLED=0; go build -mod vendor -v -o /usr/bin/azure-cns.exe -ldflags """-X main.version=${env:VERSION} -X ${env:CNS_AI_PATH}=${env:CNS_AI_ID}""" -gcflags="-dwarflocationlists=true" ./cns/service
 
 # Copy into final image
 FROM mcr.microsoft.com/windows/servercore:ltsc2022

npm/windows.Dockerfile

@@ -9,7 +9,7 @@ RUN mkdir /usr/bin/
 # Copy the source
 COPY . .
 
-RUN $Env:CGO_ENABLED=0; go build -v -o /usr/bin/npm.exe -ldflags """-X main.version=${env:VERSION} -X ${env:NPM_AI_PATH}=${env:NPM_AI_ID}""" -gcflags="-dwarflocationlists=true" ./npm/cmd/
+RUN $Env:CGO_ENABLED=0; go build -mod vendor -v -o /usr/bin/npm.exe -ldflags """-X main.version=${env:VERSION} -X ${env:NPM_AI_PATH}=${env:NPM_AI_ID}""" -gcflags="-dwarflocationlists=true" ./npm/cmd/
 
 # Copy into final image
 FROM mcr.microsoft.com/windows/servercore:ltsc2022