add arm pipeline

.drone.yml

@@ -73,3 +73,64 @@ steps:
     - tag
 
 ...
+---
+kind: pipeline
+name: default-arm
+
+platform:
+  os: linux
+  arch: arm
+
+workspace:
+  base: /go
+  path: src/github.com/metalmatze/alertmanager-bot
+
+steps:
+- name: build
+  pull: always
+  image: golang:1.13-alpine
+  environment:
+    GO111MODULE: on
+    GOPROXY: https://proxy.golang.org
+  commands:
+  - apk add -U git make
+  - make build
+  - make fmt
+  - make vet
+  - make lint
+  - make test
+  when:
+    event:
+    - push
+    - tag
+    - pull_request
+
+- name: release
+  pull: default
+  image: golang:1.13-alpine
+  environment:
+    GO111MODULE: on
+    GOPROXY: https://proxy.golang.org
+  commands:
+  - apk add -U git make
+  - make release
+  when:
+    event:
+    - tag
+
+- name: docker
+  image: plugins/docker
+  pull: always
+  settings:
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
+    repo: metalmatze/alertmanager-bot
+    tag:
+    - latest
+    - 0.4
+    - 0.4.2
+  when:
+    event:
+    - tag