Add Docker image

Dockerfile

@@ -0,0 +1,16 @@
+FROM golang:1.17-alpine as builder
+RUN mkdir build
+WORKDIR /build
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN apk add --no-cache make git
+RUN make build
+
+FROM busybox
+LABEL maintainer="marco.franssen@philips.com"
+RUN mkdir -p /app
+WORKDIR /app
+ENV VAULT_ADDR=
+COPY --from=builder build/bin/spiffe-vault .
+ENTRYPOINT [ "/app/spiffe-vault" ]

Makefile

@@ -27,11 +27,17 @@ help:
 FORCE: ;
 
 bin/%: cmd/% FORCE
-	go build $(GO_BUILD_FLAGS) -o $@ ./$<
+	CGO_ENABLED=0 go build $(GO_BUILD_FLAGS) -o $@ ./$<
 
 .PHONY: download
 download: ## download dependencies via go mod
 	go mod download
 
 .PHONY: build
 build: $(addprefix bin/,$(COMMANDS)) ## builds binaries
+
+.PHONY: image
+image: ## build the binary in a docker image
+	docker build \
+		-t "philipssoftware/spiffe-vault:$(GIT_TAG)" \
+		-t "philipssoftware/spiffe-vault:$(GIT_HASH)" .