chore(Makefile): add GONOSUMDB and GOPROXY

Makefile

@@ -12,30 +12,49 @@ ls:
 # Download dependencies
 .PHONY: download
 download:
-	go mod download
+	GONOSUMDB=${GONOSUMDB} \
+	GOPROXY=${GOPROXY} \
+		go mod download
 
 # Update project dependencies
 .PHONY: update
 update:
-	go get -u
-	go mod download
-	go mod tidy
+	GONOSUMDB=${GONOSUMDB} \
+	GOPROXY=${GOPROXY} \
+		go get -u
+
+	GONOSUMDB=${GONOSUMDB} \
+	GOPROXY=${GOPROXY} \
+		go mod download
+
+	GONOSUMDB=${GONOSUMDB} \
+	GOPROXY=${GOPROXY} \
+		go mod tidy
 
 # Run project tests
 .PHONY: test
 test: download
-	go test ./... -v -race
+	GONOSUMDB=${GONOSUMDB} \
+	GOPROXY=${GOPROXY} \
+		go test ./... -v -race
 
 # Look for "suspicious constructs" in source code
 .PHONY: vet
 vet: download
-	go vet ./...
+	GONOSUMDB=${GONOSUMDB} \
+	GOPROXY=${GOPROXY} \
+		go vet ./...
 
 # Format code
 .PHONY: fmt
 fmt: download
-	go mod tidy
-	go fmt ./...
+	GONOSUMDB=${GONOSUMDB} \
+	GOPROXY=${GOPROXY} \
+		go mod tidy
+
+	GONOSUMDB=${GONOSUMDB} \
+	GOPROXY=${GOPROXY} \
+		go fmt ./...
 
 # Check for unformatted go code
 .PHONY: check/fmt
@@ -45,16 +64,19 @@ check/fmt: download
 # Build project
 .PHONY: build
 build:
-	CGO_ENABLED=0 go build \
-	-ldflags "\
-	-X main.version=${shell git describe --tags} \
-	-X main.commit=${shell git rev-parse HEAD} \
-	-X main.date=${shell date --iso-8601=seconds} \
-	-X main.builtBy=manual \
-	" \
-	-trimpath \
-	-o ${EXECUTABLE} \
-	exporter.go
+	CGO_ENABLED=0
+	GONOSUMDB=${GONOSUMDB} \
+	GOPROXY=${GOPROXY} \
+		go build \
+			-ldflags "\
+				-X main.version=${shell git describe --tags} \
+				-X main.commit=${shell git rev-parse HEAD} \
+				-X main.date=${shell date --iso-8601=seconds} \
+				-X main.builtBy=manual \
+			" \
+			-trimpath \
+			-o ${EXECUTABLE} \
+			exporter.go
 
 # build container-image
 .PHONY: build/container-image