chore(ci): bump rust version

.woodpecker/build.yml

@@ -7,7 +7,7 @@ when:
 
 steps:
   build:
-    image: 'rust:1.79-alpine3.19'
+    image: 'rust:1.79-alpine3.18'
     commands:
       - apk add --no-cache build-base libarchive libarchive-dev
       - cargo build --verbose

.woodpecker/lint.yml

@@ -3,11 +3,11 @@ platform: 'linux/amd64'
 when:
   branch:
     exclude: [main]
-  event: [push, pull_request]
+  event: push
 
 steps:
   lint:
-    image: 'rust:1.79-alpine3.19'
+    image: 'rust:1.70-alpine3.18'
     commands:
       - rustup component add rustfmt
       - cargo fmt -- --check