feat(ci): add lint stage

.woodpecker/lint.yml

@@ -0,0 +1,13 @@
+platform: 'linux/amd64'
+
+branches:
+  exclude: [main]
+
+pipeline:
+  lint:
+    image: 'rust:1.70-alpine3.18'
+    commands:
+      - rustup component add rustfmt
+      - cargo fmt -- --check
+    when:
+      event: [push]