doc: Add a flake.nix to ease build environment setup

.github/workflows/nix-flake-check.yaml

@@ -0,0 +1,15 @@
+name: Nix Flake Checks
+
+on: [push, pull_request]
+
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+      - uses: cachix/install-nix-action@v31
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+      - run: nix flake check
+      - run: nix develop . --command cargo build

README.md

@@ -55,6 +55,8 @@ If you aren't using a debugger (or want to use other debugging configurations),
 <details open="open">
   <summary><h2 style="display: inline-block" id="installation-of-development-dependencies">Installation of development dependencies</h2></summary>
 
+If you are using [Nix](https://nixos.org/), you can use the `devShell` made available in `flake.nix`. Otherwise, you can follow these commands (provided you already have [`Rustup`](https://rustup.rs/) installed):
+
 ```sh
 rustup target install thumbv6m-none-eabi
 cargo install flip-link

cargo-generate/flake.nix

@@ -0,0 +1,38 @@
+{
+  description = "Flake configuration for my systems";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { nixpkgs, utils, rust-overlay, ... }:
+    utils.lib.eachDefaultSystem (system:
+      let pkgs = import nixpkgs { inherit system; overlays = [ (import rust-overlay) ]; };
+      in {
+        devShells.default = pkgs.mkShell {
+          buildInputs = [
+            pkgs.flip-link
+            (pkgs.rust-bin.stable.latest.default.override {
+              extensions = [
+                "rust-src"
+                "clippy"
+                "rust-analyzer"
+              ];
+              targets = [ "thumbv6m-none-eabi" ];
+            })
+          ];
+          {% case flash_method -%}
+  {%- when "probe-rs" -%}
+          propagatedBuildInputs = [ pkgs.probe-rs ];
+  {%- when "elf2uf2-rs" -%}
+          propagatedBuildInputs = [ pkgs.elf2uf2-rs ];
+  {%- when "none" -%}
+  {%- else -%}
+{%- endcase %}
+        };
+      });
+}
+

cargo-generate/remove_rprs.rhai

@@ -6,4 +6,5 @@ file::delete(".vscode/launch.json");
 file::rename("cargo-generate/Cargo.toml", "Cargo.toml");
 file::rename("cargo-generate/config.toml", ".cargo/config.toml");
 file::rename("cargo-generate/launch.json", ".vscode/launch.json");
+file::rename("cargo-generate/flake.nix", "flake.nix");
 file::delete("cargo-generate")

flake.nix

@@ -0,0 +1,30 @@
+{
+  description = "Flake configuration for my systems";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { nixpkgs, utils, rust-overlay, ... }:
+    utils.lib.eachDefaultSystem (system:
+      let pkgs = import nixpkgs { inherit system; overlays = [ (import rust-overlay) ]; };
+      in {
+        devShells.default = pkgs.mkShell {
+          buildInputs = [
+            pkgs.flip-link
+            (pkgs.rust-bin.stable.latest.default.override {
+              extensions = [
+                "rust-src"
+                "clippy"
+                "rust-analyzer"
+              ];
+              targets = [ "thumbv6m-none-eabi" ];
+            })
+          ];
+          propagatedBuildInputs = [ pkgs.probe-rs pkgs.elf2uf2-rs ];
+        };
+      });
+}