Fix CI workflow: update actions/setup-rust to v4, use stable Rust, fix test command

.gitea/workflows/ci.yml

@@ -3,21 +3,32 @@ name: CI
 on:
   push:
     branches: [main]
-    paths-ignore:
-      - 'api-token-vault/**'
   pull_request:
     branches: [main]
-    paths-ignore:
-      - 'api-token-vault/**'
 
 jobs:
   test:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-rust@v1
+      - uses: actions/setup-rust@v4
         with:
           rust-version: stable
-      - run: cargo build --all-features
-      - run: cargo test --all-features
-      - run: cargo clippy --all-features -- -D warnings
+          components: rustfmt, clippy
+      - name: Build
+        run: cargo build --all-features
+      - name: Run tests
+        run: cargo test
+      - name: Clippy
+        run: cargo clippy --all-features -- -D warnings
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-rust@v4
+        with:
+          rust-version: stable
+          components: rustfmt
+      - name: Check formatting
+        run: cargo fmt -- --check