(maint) move to use the arm64 pool (#3296)

.drone.yml

@@ -41,9 +41,12 @@ steps:
 
 ---
 kind: pipeline
-type: docker
+type: vm
 name: linux-arm64
 
+pool:
+  use: ubuntu_arm64
+
 platform:
   arch: arm64
   os: linux
@@ -77,44 +80,6 @@ trigger:
 depends_on:
 - linux-amd64
 
-# ---
-# kind: pipeline
-# type: docker
-# name: linux-arm
-
-# platform:
-#   arch: arm
-#   os: linux
-
-# steps:
-# - name: build
-#   image: golang:1.14.15
-#   commands:
-#   - sh scripts/build.sh
-#   environment:
-#     GOARCH: arm
-#     GOOS: linux
-
-# - name: publish
-#   image: plugins/docker:18
-#   settings:
-#     auto_tag: true
-#     auto_tag_suffix: linux-arm
-#     dockerfile: docker/Dockerfile.server.linux.arm
-#     repo: drone/drone
-#     username:
-#       from_secret: docker_username
-#     password:
-#       from_secret: docker_password
-
-# trigger:
-#   event:
-#   - push
-#   - tag
-
-# depends_on:
-# - linux-amd64
-
 ---
 kind: pipeline
 type: docker
@@ -139,4 +104,4 @@ trigger:
 
 depends_on:
 - linux-arm64
-# - linux-arm
+