ci: replace setup-rust-toolchain action with direct rustup install

.gitea/workflows/ci.yml

@@ -15,13 +15,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Setup Rust
-        uses: actions-rust-lang/setup-rust-toolchain@v1
-        with:
-          toolchain: stable
-
-      - name: Install rustfmt and clippy
-        run: rustup component add rustfmt clippy
+      - name: Setup Rust with rustfmt and clippy
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable --profile default
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+          $HOME/.cargo/bin/rustup component add rustfmt clippy
 
       - name: Build
         run: cargo build --release
@@ -44,9 +42,9 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Setup Rust
-        uses: actions-rust-lang/setup-rust-toolchain@v1
-        with:
-          toolchain: stable
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable --profile default
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
 
       - name: Build release binary
         run: cargo build --release