feat: multi-stage builds

.drone.yml

@@ -20,6 +20,12 @@ steps:
     commands:
       - echo bonjour monde
 
+  - name: build
+    image: golang:1.17-alpine
+    pull: if-not-exists
+    commands:
+      - CGO_ENABLED=0 GOOS="linux" GOARCH="amd64" go build -ldflags="-s -w" -tags timetzdata -o app main.go
+
   - name: docker
     image: plugins/docker
     settings:

Dockerfile

@@ -1,22 +1,21 @@
-FROM golang:alpine as builder
+FROM alpine:3.14 as builder
 
 ENV CGO_ENABLED=0
 ENV GOOS="linux"
 ENV GOARCH="amd64"
 
-ADD ./ /src
-
 WORKDIR /src
 
 RUN apk --no-cache add ca-certificates
-RUN go build -ldflags="-s -w" -tags timetzdata -o app main.go
+#RUN go build -ldflags="-s -w" -tags timetzdata -o app main.go
 
 FROM scratch as production
 
 ENV TZ="Asia/Shanghai"
 
-COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+ADD ./app .
-COPY --from=builder /src/app .
 
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+#COPY --from=builder /src/app .
 
 CMD ["./app"]