[test] Multistage build with drone CI

.drone.yml

@@ -29,6 +29,46 @@ steps:
   - name: gopath
     path: /go
   
+- name: build_image
+  image: plugins/docker
+  commands:
+  - branch=$(echo $CI_COMMIT_BRANCH | grep -v '/') || echo $CI_COMMIT_BRANCH
+  - p1=$(echo $CI_COMMIT_BRANCH | cut -d '/' -f1 -s)
+  - p2=$(echo $CI_COMMIT_BRANCH | cut -d '/' -f2 -s)
+  - tag=${branch:-$p1-$p2}
+  - docker build -t git.pbiernat.dev/golang/vegvisir:$tag -f Dockerfile.build .
+  volumes:
+  - name: docker-sock
+    path: /var/run
+  
+- name: push_image
+  image: plugins/docker
+  environment:
+    DOCKER_USERNAME:
+      from_secret: registry_username
+    DOCKER_PASSWORD:
+      from_secret: registry_password
+  commands:
+  - simple=$(echo $CI_COMMIT_BRANCH | grep '/') || echo $CI_COMMIT_BRANCH
+  - p1=$(echo $CI_COMMIT_BRANCH | cut -d '/' -f1 -s)
+  - p2=$(echo $CI_COMMIT_BRANCH | cut -d '/' -f2 -s)
+  - tag=${simple:=$p1-$p2}
+  - echo $DOCKER_PASSWORD | docker login git.pbiernat.dev -u $DOCKER_USERNAME --password-stdin &&
+  - docker push git.pbiernat.dev/golang/vegvisir:$tag
+  volumes:
+  - name: docker-sock
+    path: /var/run
+
+services:
+- name: docker
+  image: docker:dind
+  privileged: true
+  volumes:
+  - name: docker-sock
+    path: /var/run
+
 volumes:
 - name: gopath
   temp: {}
+- name: docker-sock
+  temp: {}

Dockerfile

@@ -1,11 +0,0 @@
-FROM golang:1.16-alpine
-
-RUN mkdir /go/src/vegvisir
-WORKDIR /go/src/vegvisir
-
-COPY vegvisir.json go.mod go.sum ./
-COPY pkg/ ./pkg
-
-RUN go mod download
-
-CMD ["go", "run", "pkg/main.go"]

Dockerfile.build

@@ -0,0 +1,22 @@
+# Builder
+FROM golang:alpine AS builder
+
+WORKDIR /go/src/app
+
+ARG MAIN_GO=pkg/main.go
+# ARG HTTP_PORT=8080
+# ENV HTTP_PORT {$HTTP_PORT}
+
+COPY go.mod go.sum ./
+COPY pkg ./pkg
+
+RUN go mod download && \
+    CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /go/bin/app $MAIN_GO
+
+# Destination image
+FROM gcr.io/distroless/base-debian10
+
+COPY --from=builder /go/bin/app /app
+
+EXPOSE $HTTP_PORT
+ENTRYPOINT ["/app"]

Dockerfile.run

@@ -0,0 +1,11 @@
+FROM golang:alpine
+
+# RUN mkdir /go/src/app
+WORKDIR /go/src/app
+
+COPY go.mod go.sum ./
+COPY pkg ./
+
+RUN go mod download
+
+ENTRYPOINT ["go", "run", "pkg/main.go"]

vegvisir.json.test

@@ -0,0 +1,19 @@
+{
+    "server": {
+        "address": "127.0.0.1",
+        "port": 8080
+    },
+    "backends": {
+        "dummy-app": {
+            "prefixURL": "/",
+            "backendAddress": "http://172.17.0.1:80",
+            "routes": [{
+                "pattern": "(.+)",
+                "target": "$1"
+            }]
+        }
+    },
+    "cache": {
+        "type": "memory"
+    }
+}