feat: embed the carrier icon in the Windows exe

Cargo.lock

@@ -125,6 +125,7 @@ dependencies = [
  "rand_core",
  "relm4",
  "tempfile",
+ "winresource",
 ]
 
 [[package]]
@@ -1630,6 +1631,16 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "winresource"
+version = "0.1.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0986a8b1d586b7d3e4fe3d9ea39fb451ae22869dcea4aa109d287a374d866087"
+dependencies = [
+ "toml",
+ "version_check",
+]
+
 [[package]]
 name = "x25519-dalek"
 version = "2.0.1"

Cargo.toml

@@ -15,5 +15,8 @@ relm4 = { version = "0.9", features = ["libadwaita"] }
 rand_core = { version = "0.6", features = ["getrandom"] }
 qrcodegen = "1"
 
+[build-dependencies]
+winresource = "0.1"
+
 [dev-dependencies]
 tempfile = "3"

build.rs

@@ -0,0 +1,10 @@
+// Windows reads the taskbar and Explorer icon from the exe's resource
+// section; desktop environments on other platforms use the desktop file.
+fn main() {
+    println!("cargo:rerun-if-changed=data/icons/com.randogoth.carrier.ico");
+    if std::env::var("CARGO_CFG_WINDOWS").is_ok() {
+        let mut res = winresource::WindowsResource::new();
+        res.set_icon("data/icons/com.randogoth.carrier.ico");
+        res.compile().expect("failed to embed Windows icon");
+    }
+}