Added backend linting job

.woodpecker.yml

@@ -13,6 +13,13 @@ pipeline:
             - cd web
             - yarn run lint
 
+    # This doesn't require compiling anything
+    lint-backend:
+        image: chewingbever/fej-builder:latest
+        pull: true
+        commands:
+            - cargo fmt -- --check
+
     # Backend cicd jobs are disabled until we can figure out a way to cache stuff
     # test-backend:
     #     image: chewingbever/fej-builder:latest