Add Drone step for pushing linux/arm64 image to DockerHub (#426)

.drone.yml

@@ -263,6 +263,69 @@ trigger:
   event:
     - promote
 
+---
+kind: pipeline
+type: docker
+name: OSS Release (arm64)
+platform:
+  os: linux
+  arch: arm64
+
+steps:
+  - name: Check Promote
+    image: alpine
+    commands:
+      - if [ -z "$DRONE_DEPLOY_TO" ]; then echo "Missing DRONE_DEPLOY_TO (Target)"; exit 1; fi
+      - if [ -z "$DRONE_TAG" ]; then echo "Missing DRONE_TAG"; exit 1; fi
+      - echo Promoting $DRONE_TAG to $DRONE_DEPLOY_TO
+
+  - name: Image Tag
+    image: alpine
+    commands:
+      - apk add --no-cache bash git sed
+      - git fetch origin --tags
+      - chmod +x ./tools/image-tag.sh
+      - echo $(./tools/image-tag.sh)
+      - echo $(./tools/image-tag.sh) > .tags
+      - if [ -z "$DRONE_TAG" ]; then echo "No tag, not modifying version"; else sed "0,/VERSION.*/ s/VERSION.*/VERSION = \"${DRONE_TAG}\"/g" engine/settings/base.py > engine/settings/base.temp && mv engine/settings/base.temp engine/settings/base.py; fi
+      - cat engine/settings/base.py | grep VERSION | head -1
+    depends_on:
+      - Check Promote
+    when:
+      event:
+        - promote
+      target:
+        - oss
+      ref:
+        - refs/tags/v*.*.*
+
+  - name: Build and Push Engine Docker Image Backend to Dockerhub
+    image: plugins/docker
+    settings:
+      repo: grafana/oncall
+      dockerfile: engine/Dockerfile
+      context: engine/
+      password:
+        from_secret: docker_password
+      username:
+        from_secret: docker_username
+    depends_on:
+      - Image Tag
+
+  - name: Unrecognized Promote Target
+    image: alpine
+    commands:
+      - echo $DRONE_DEPLOY_TO is not a recognized promote target!
+      - exit 1
+    when:
+      target:
+        exclude:
+          - oss
+
+trigger:
+  event:
+    - promote
+
 ---
 # Secret for pulling docker images.
 kind: secret