Refactor pipeline to use new Docker build plugin

This commit removes the old Docker plugin and replaces it with a new one that supports multi-architecture builds. The `platform` field was removed from the matrix, and the `build` step was replaced with `${version}-${os}`. The new plugin also uses different settings for `repo`, `platforms`, and `username`.

.woodpecker.yml

@@ -1,7 +1,4 @@
 matrix:
-  platform:
-    - amd64
-    - arm64
   os:
     - alpine
     - slim
@@ -10,18 +7,16 @@ matrix:
     - 18
     - 20
 
-platform: linux/${platform}
-
 pipeline:
-  build:
-    image: plugins/docker
+  ${version}-${os}:
+    image: woodpeckerci/plugin-docker-buildx
     settings:
-      registry: techio.dev
-      repo: techio.dev/${CI_REPO}
+      repo: lttech/pm2
+      platforms: linux/amd64,linux/arm64/v8
       tags:
-        - ${version}-${os}-${platform}
+        - ${version}-${os}
       build_args:
         - tag=${version}-${os}
-      username: deploy
+      username: lttech
       password:
-        from_secret: deploy_password
+        from_secret: docker_lttech