change swagger build

.drone.yml

@@ -4,21 +4,35 @@ type: docker
 name: default
 
 steps:
-  - name: build docker image
+  - name: build docker image (alpine)
     image: plugins/docker
     environment:
       DOCKER_BUILDKIT: '1'
     settings:
       purge: true
       repo: otakukaze/golang-base-image
-      tags:
-        - "${DRONE_BRANCH}"
       username: otakukaze
       password:
         from_secret: password
-      build_args:
-        - "IMG_TAG=${DRONE_BRANCH}"
+      tags:
+        - "${DRONE_BRANCH}"
     when:
       ref:
         - refs/heads/1-alpine
 
+  - name: build docker image (debian)
+    image: plugins/docker
+    environment:
+      DOCKER_BUILDKIT: '1'
+    settings:
+      purge: true
+      repo: otakukaze/golang-base-image
+      username: otakukaze
+      password:
+        from_secret: password
+      tags:
+        - "1"
+        - "latest"
+    when:
+      ref:
+        - refs/heads/master

Dockerfile

@@ -1,5 +1,11 @@
-ARG IMG_TAG=1-alpine
+ARG IMG_TAG=1
+FROM golang:${IMG_TAG} as builder
+RUN go get -u -v github.com/go-bindata/go-bindata/... \
+  && dir=$(mktemp -d) \
+  && git clone https://github.com/go-swagger/go-swagger "$dir" \
+  && cd "$dir" \
+  && go install ./cmd/swagger
+
 FROM golang:${IMG_TAG}
-RUN apk add --no-cache git make gcc libc-dev \
-  && go get -u github.com/go-bindata/go-bindata/... \
-  && go get -u github.com/go-swagger/go-swagger/...
+COPY --from=builder /go/bin/swagger /usr/bin
+COPY --from=builder /go/bin/go-bindata /usr/bin