Improve cached dependency fetching in Dockerfile

Signed-off-by: Markus Blaschke <mblaschke82@gmail.com>

Author: mblaschke

Dockerfile

@@ -5,7 +5,8 @@ WORKDIR /go/src/github.com/webdevops/kube-bootstrap-token-manager
 # Get deps (cached)
 COPY ./go.mod /go/src/github.com/webdevops/kube-bootstrap-token-manager
 COPY ./go.sum /go/src/github.com/webdevops/kube-bootstrap-token-manager
-RUN go mod download
+COPY ./Makefile /go/src/github.com/webdevops/kube-pool-manager
+RUN make dependencies
 
 # Compile
 COPY ./ /go/src/github.com/webdevops/kube-bootstrap-token-manager

Makefile

@@ -36,6 +36,7 @@ lint: $(GOLANGCI_LINT_BIN)
 	$(GOLANGCI_LINT_BIN) run -D megacheck -E unused,gosimple,staticcheck --timeout=10m
 
 dependencies: $(GOLANGCI_LINT_BIN)
+	go mod download
 
 $(GOLANGCI_LINT_BIN):
 	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(FIRST_GOPATH)/bin v1.23.8