fix: resolve rustfmt CI failure by using dtolnay/rust-toolchain@master with fallback

.gitea/workflows/ci.yml

@@ -1 +1,47 @@
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+name: CI
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          components: rustfmt, clippy
+
+      - name: Check rustfmt availability
+        run: command -v rustfmt || rustup component add rustfmt
+
+      - name: Run Rust linting
+        working-directory: ./gitignore-gen
+        run: |
+          cargo fmt --check
+          cargo clippy --all-targets --all-features -- -D warnings
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          components: rustfmt
+
+      - name: Build Rust project
+        working-directory: ./gitignore-gen
+        run: cargo build --all-targets
+
+      - name: Run Rust tests
+        working-directory: ./gitignore-gen
+        run: cargo test