chore(ci): move clippy to build step

.woodpecker/build.yml

@@ -26,7 +26,11 @@ steps:
       - cargo build --verbose
       # Binaries, even debug ones, should be statically compiled
       - '[ "$(readelf -d target/debug/rieterd | grep NEEDED | wc -l)" = 0 ]'
-      # Clippy also performs a full build, so putting it here saves the CI a
-      # lot of work
+
+  clippy:
+    image: 'rust:1.79-alpine3.19'
+    environment:
+      - 'LIBARCHIVE_STATIC=1'
+    commands:
       - rustup component add clippy
       - cargo clippy -- --no-deps -Dwarnings