Use BuildX to cross-compile for ARM.

.drone.yml

@@ -1,23 +1,33 @@
 ---
 kind: pipeline
 type: docker
-name: tag
+name: default
+
+volumes:
+  - name: docker_socket
+    host:
+      path: /var/run/docker.sock
 
 steps:
   - name: build  
-    image: plugins/docker
+    image: alexviscreanu/buildx
-    settings:
+    commands:
-      registry: registry.thegibsonhome.net
+      - docker run --rm --privileged docker/binfmt:a7996909642ee92942dcd6cff44b9b95f08dad64
-      username:
+      - export BUILDER_ID="crosscomp-$(cat /proc/self/cgroup | head -1 | cut -d '/' -f 3)"
+      - docker buildx create --use --name $BUILDER_ID --driver-opt image=stargate01/buildkit
+      - docker buildx inspect --bootstrap
+      - docker login --username $REGISTRY_USERNAME --password $REGISTRY_PASSWORD registry.thegibsonhome.net
+      - docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 --output=type=image,push=true --progress tty -t registry.thegibsonhome.net/protonmail-bridge:latest .
+      - docker buildx rm $BUILDER_ID
+    volumes:
+      - name: docker_socket
+        path: /var/run/docker.sock
+    environment:
+      REGISTRY_USERNAME:
         from_secret: registry_username
-      password:
+      REGISTRY_PASSWORD:
         from_secret: registry_password
-      repo: registry.thegibsonhome.net/protonmail-bridge
+
-      build_args:
+#trigger:
-        - TAG=${DRONE_TAG}
+#  event:
-      tags:
+#    - tag
-        - ${DRONE_TAG}
-        - latest
-trigger:
-  event:
-    - tag