Add format job

.gitlab-ci.yml

@@ -11,6 +11,23 @@ stages:
   - release
   - distribute
 
+format:
+  stage: test
+  image: rust:latest
+  before_script:
+    - rustup component add rustfmt
+
+  script:
+    - cargo fmt --all -- --check --verbose
+
+  cache:
+    key: fmt-cache
+    paths:
+      - ~/.cargo/bin/
+      - ~/.cargo/git/db/
+      - ~/.cargo/registry/cache/
+      - ~/.cargo/registry/index/
+
 # base earthly setup for jobs
 .base:
   tags: [ saas-linux-medium-amd64 ]