CI: configure drone

.drone.yml

@@ -0,0 +1,32 @@
+---
+kind: pipeline
+type: kubernetes
+name: build
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: formatting-check
+  image: golang
+  commands:
+  - test -z $(gofmt -l .)
+- name: build
+  image: docker
+  commands:
+  - docker build
+---
+kind: pipeline
+type: kubernetes
+name: deploy
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: build
+  image: docker
+  commands:
+  - docker login "docker.zvon.tech" -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"
+  - docker buildx create --use
+  - docker buildx build -f Dockerfile -t "docker.zvon.tech/lunch-go:${DRONE_TAG}" --platform linux/amd64,linux/arm64 --push .