Cleaned formatting, set arch requirement.

.drone.yml

@@ -6,6 +6,9 @@ name: default
 environment:
   DOCKER_CLI_EXPERIMENTAL: enabled
 
+platform:
+  arch: amd64
+
 services:
   - name: dind
     image: docker:dind
@@ -23,17 +26,25 @@ steps:
   - name: build
     image: docker:latest
     commands:
-      - 'case $(uname -a) in *x86_64*) export ARCH="amd64" ;; *) export ARCH="unknown" ;; esac'
-      - 'export BUILDX_URL=$(wget -q -O - https://api.github.com/repos/docker/buildx/releases/latest | grep "browser_download_url.*linux-$ARCH" | cut -d: -f2,3 | tr -d \")'
-      - 'mkdir -p ~/.docker/cli-plugins'
-      - 'wget -O ~/.docker/cli-plugins/docker-buildx $BUILDX_URL'
-      - 'chmod a+x ~/.docker/cli-plugins/docker-buildx'
-      - 'docker version'
-      - 'docker buildx version'
-      - 'docker run --rm --privileged multiarch/qemu-user-static --reset -p yes'
-      - 'echo -n $REGISTRY_PASS | docker login -u $REGISTRY_USER --password-stdin $REGISTRY_HOST'
-      - 'docker buildx create --name multiarch --use'
-      - 'docker buildx build --platform linux/amd64,linux/arm64 --output=type=image,push=true --progress tty --build-arg TAG=$DRONE_TAG -t $REGISTRY_HOST/$IMAGE:$DRONE_TAG -t $REGISTRY_HOST/$IMAGE:latest .'
+      - >-
+        case $(uname -a) in
+          *x86_64*)
+            export ARCH="amd64"
+            ;;
+          *)
+            export ARCH="unknown"
+            ;;
+          esac
+      - export BUILDX_URL=$(wget -q -O - https://api.github.com/repos/docker/buildx/releases/latest | grep "browser_download_url.*linux-$ARCH" | cut -d: -f2,3 | tr -d \")
+      - mkdir -p ~/.docker/cli-plugins
+      - wget -O ~/.docker/cli-plugins/docker-buildx $BUILDX_URL
+      - chmod a+x ~/.docker/cli-plugins/docker-buildx
+      - docker version
+      - docker buildx version
+      - docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+      - echo -n $REGISTRY_PASS | docker login -u $REGISTRY_USER --password-stdin $REGISTRY_HOST
+      - docker buildx create --name multiarch --use
+      - docker buildx build --platform linux/amd64,linux/arm64 --output=type=image,push=true --progress tty --build-arg TAG=$DRONE_TAG -t $REGISTRY_HOST/$IMAGE:$DRONE_TAG -t $REGISTRY_HOST/$IMAGE:latest .
     volumes:
       - name: docker_socket
         path: /var/run