build: add directory-oriented make workflows

firmware/rust-toolchain.toml

@@ -1,8 +1,14 @@
 [toolchain]
 channel = "1.90.0"
-components = ["cargo", "clippy", "rustfmt", "rust-analyzer", "llvm-tools-preview"]
+components = [
+  "cargo",
+  "clippy",
+  "rustfmt",
+  "rust-analyzer",
+  "llvm-tools-preview",
+]
 targets = [
-    "thumbv7em-none-eabihf",
-    "thumbv7em-none-eabi",
-    "x86_64-unknown-linux-gnu",
+  "thumbv7em-none-eabihf",
+  "thumbv7em-none-eabi",
+  "x86_64-unknown-linux-gnu",
 ]