[feature] Added CI config

.drone.yml

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+kind: pipeline
+type: docker
+name: default
+
+steps:
+- name: go_static_check
+  image: golang:latest
+  commands:
+  - go install honnef.co/go/tools/cmd/staticcheck@latest
+  - staticcheck ./internal/...
+  volumes:
+  - name: gopath
+    path: /go
+
+- name: go_lint
+  image: golang:latest
+  commands:
+  - go install golang.org/x/lint/golint@latest
+  - golint ./internal/...
+  volumes:
+  - name: gopath
+    path: /go
+
+- name: go_vet
+  image: golang:latest
+  commands:
+  - go vet ./internal/...
+  volumes:
+  - name: gopath
+    path: /go
+  
+- name: build_image
+  image: plugins/docker
+  commands:
+  - sleep 5
+  - ./deploy/docker/build_image.sh
+  depends_on:
+  - go_static_check
+  - go_lint
+  - go_vet
+  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:
+  - ./deploy/docker/publish_image.sh
+  depends_on:
+  - build_image
+  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: {}

deploy/docker/Dockerfile.build

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+# Builder
+FROM golang:alpine AS builder
+
+WORKDIR /go/src/app
+
+ARG MAIN_GO=cmd/server/main.go
+
+ARG SERVER_PORT=8080
+ENV SERVER_PORT {$SERVER_PORT}
+
+COPY go.mod go.sum ./
+COPY internal ./internal
+COPY cmd ./cmd
+
+RUN ls -lh
+
+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 $SERVER_PORT
+ENTRYPOINT ["/app"]

deploy/docker/Dockerfile.run

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+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"]

deploy/docker/build_image.sh

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+#!/bin/sh
+set -evx
+
+branch=${DRONE_TAG:=$CI_COMMIT_BRANCH}
+branch=$(echo $branch | grep -v /) || echo $branch ;
+p1=$(echo $branch | cut -d / -f1 -s) &&
+p2=$(echo $branch | cut -d / -f2 -s) &&
+tag=${branch:=$p1-$p2} && 
+echo "Building" $tag
+
+docker build -t git.pbiernat.dev/golang/rest-api-prototype:$tag -f deploy/docker/Dockerfile.build .

deploy/docker/publish_image.sh

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+#!/bin/sh
+set -evx
+
+branch=${DRONE_TAG:=$CI_COMMIT_BRANCH}
+branch=$(echo $branch | grep -v /) || echo $branch ;
+p1=$(echo $branch | cut -d / -f1 -s) &&
+p2=$(echo $branch | cut -d / -f2 -s) &&
+tag=${branch:=$p1-$p2} && 
+echo "Publishing" $tag
+
+echo $DOCKER_PASSWORD | docker login git.pbiernat.dev -u $DOCKER_USERNAME --password-stdin &&
+docker push git.pbiernat.dev/golang/rest-api-prototype:$tag