fix: improve template usability and reproducibility

- Fix rust-analyzer "can't find crate for test" by adding check.allTargets: false
- Add rust-toolchain.toml to pin toolchain version, target, and components
- Add cargo-binutils and llvm-tools to Dockerfile for binary inspection/disassembly
- Add defmt-test for on-target embedded testing with example test

Agent-Logs-Url: https://github.com/Baker-link-Lab/bakerlink_tutorial_template/sessions/f183cbad-512b-43ab-a93c-048310787e22

Co-authored-by: Baker-Tanaka <42606588+Baker-Tanaka@users.noreply.github.com>

Author: Copilot

.docker/Dockerfile

@@ -3,3 +3,5 @@ FROM rust:1.86.0-bullseye
 RUN rustup target install thumbv6m-none-eabi
 RUN cargo install flip-link --version 0.1.10
 RUN rustup component add rustfmt
+RUN rustup component add llvm-tools
+RUN cargo install cargo-binutils

.vscode/settings.json

@@ -1,4 +1,5 @@
 {
     "rust-analyzer.cargo.target": "thumbv6m-none-eabi",
+    "rust-analyzer.check.allTargets": false,
     "editor.formatOnSave": true
 }

Cargo.toml

@@ -16,6 +16,13 @@ rp2040-hal = { version = "0.10", features = ["rt", "critical-section-impl"] }
 rp2040-boot2 = "0.3"
 critical-section = "1.0.0"
 
+[dev-dependencies]
+defmt-test = "0.3"
+
+[[test]]
+name = "example_test"
+harness = false
+
 # cargo build/run
 [profile.dev]
 codegen-units = 1

rust-toolchain.toml

@@ -0,0 +1,4 @@
+[toolchain]
+channel = "1.86.0"
+targets = ["thumbv6m-none-eabi"]
+components = ["rustfmt", "llvm-tools"]

tests/example_test.rs

@@ -0,0 +1,20 @@
+#![no_std]
+#![no_main]
+
+use defmt_rtt as _;
+use panic_probe as _;
+use rp2040_hal as _;
+
+#[link_section = ".boot2"]
+#[used]
+pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_GENERIC_03H;
+
+#[defmt_test::tests]
+mod tests {
+    use defmt::assert;
+
+    #[test]
+    fn it_works() {
+        assert!(true);
+    }
+}