test buildx multiarch support

.drone.yml

@@ -28,17 +28,15 @@ platform:
 
 steps:
 - name: dryrun
-  image: plugins/docker:19
-  settings:
-    dockerfile: Dockerfile
-    dry_run: true
-    password:
-      from_secret: docker_password
-    repo: thegeeklab/${DRONE_REPO_NAME}
-    username:
-      from_secret: docker_username
+  image: jdrouet/docker-with-buildx:stable
+  commands:
+  - docker buildx ls
+  - docker buildx create --use
+  - docker buildx ls
+  - docker buildx build --platform linux/arm/v7,linux/arm64/v8,linux/amd64 --tag thegeeklab/${DRONE_REPO_NAME}:latest .
   environment:
-    DOCKER_BUILDKIT: 1
+    DOCKER_DRIVER: overlay2
+    DOCKER_HOST: tcp://dind:2375/
   when:
     ref:
     - refs/pull/**
@@ -106,6 +104,10 @@ steps:
   - publish-dockerhub
   - publish-quay
 
+services:
+- name: dind
+  image: docker:dind
+
 trigger:
   ref:
   - refs/heads/main
@@ -181,6 +183,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: 14eb650adf452610ccb668009fadc51bbd44f9cede6a037ae2c4430c72458b5e
+hmac: dddb86bc5f442e55752da00c78dd314ac7311513aa299caff92af7735730f4df
 
 ...