wip: github actions for rust

Author: filipton

.github/workflows/build-firmware.yaml

@@ -0,0 +1,40 @@
+name: Continuous Integration
+
+on:
+  push:
+    paths-ignore:
+      - "**/README.md"
+  pull_request:
+  workflow_dispatch:
+
+env:
+  CARGO_TERM_COLOR: always
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+jobs:
+  rust-checks:
+    name: Rust Checks
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        action:
+          - command: build
+            args: --no-default-features --features=esp32c3 --target=riscv32imc-unknown-none-elf --release
+          - command: fmt
+            args: --all -- --check --color always
+          - command: clippy
+            args: --no-default-features --features=esp32c3 --target=riscv32imc-unknown-none-elf --workspace -- -D warnings
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          target: riscv32imc-unknown-none-elf
+          toolchain: stable
+          components: rust-src, rustfmt, clippy
+      - name: Enable caching
+        uses: Swatinem/rust-cache@v2
+      - name: Run command
+        run: cargo ${{ matrix.action.command }} ${{ matrix.action.args }}

.github/workflows/rust_ci.yaml

@@ -3,7 +3,7 @@ use std::{
     path::{Path, PathBuf},
 };
 
-const VERSION_TEMPLATE: &'static str = r#"
+const VERSION_TEMPLATE: &str = r#"
 pub const VERSION: &'static str = "{version}";
 pub const CHIP: &'static str = "{chip}";
 pub const FIRMWARE: &'static str = "{firmware}";
@@ -23,7 +23,7 @@ fn main() {
     crc_walkdir(PathBuf::from("src"), &mut hasher);
     let src_crc = hasher.finalize();
 
-    let mut version_str = if let Ok(rel) = std::env::var("RELEASE_BUILD") {
+    let version_str = if let Ok(rel) = std::env::var("RELEASE_BUILD") {
         rel
     } else {
         let epoch = std::time::SystemTime::now()