use an action for installing rust

.forgejo/workflows/rust_build.yml

@@ -15,17 +15,13 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Install Rust
-        run: |
-          apt-get update
-          apt-get install -y curl build-essential
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly
-
-      - name: Install rust-src
-        run: rustup toolchain install nightly --component rust-src
-
-      - name: Install RISC-V target
-        run: rustup target add riscv32imc-unknown-none-elf
+      - name: Install Rust toolchain
+        uses: https://github.com/actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          components: rust-src
+          target: riscv32imc-unknown-none-elf
+          override: true
 
       - name: Build Release
         run: cargo build --release