fix: embed a VERSIONINFO resource in the Windows binary (#11433)

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

backend/Cargo.lock

@@ -14876,6 +14876,7 @@ dependencies = [
  "windmill-worker-volumes",
  "windows-service",
  "windows-sys 0.52.0",
+ "winresource",
 ]
 
 [[package]]
@@ -17382,6 +17383,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "winresource"
+version = "0.1.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0986a8b1d586b7d3e4fe3d9ea39fb451ae22869dcea4aa109d287a374d866087"
+dependencies = [
+ "version_check",
+]
+
 [[package]]
 name = "winsafe"
 version = "0.0.19"

backend/Cargo.toml

@@ -329,6 +329,9 @@ strum.workspace = true
 windows-service = "0.7"
 windows-sys = { version = "0.52", features = ["Win32_System_Services", "Win32_System_Console", "Win32_Foundation"] }
 
+[target.'cfg(windows)'.build-dependencies]
+winresource = { version = "0.1.31", default-features = false }
+
 [target.'cfg(not(target_env = "msvc"))'.dependencies]
 tikv-jemallocator = { optional = true, workspace = true }
 tikv-jemalloc-sys = { optional = true, workspace = true }

backend/build.rs

@@ -2,4 +2,19 @@
 fn main() {
     // trigger recompilation when a new migration is added
     println!("cargo:rerun-if-changed=migrations");
+
+    // Embed a VERSIONINFO resource so the exe's file properties carry the release
+    // version (from Cargo.toml), which Windows worker update scripts read.
+    // `cfg(windows)` is the host, matching the Windows-only build-dependency, so
+    // cross builds to Windows get no version resource.
+    #[cfg(windows)]
+    if std::env::var("CARGO_CFG_TARGET_OS").as_deref() == Ok("windows") {
+        winresource::WindowsResource::new()
+            .set("ProductName", "Windmill")
+            .set("FileDescription", "Windmill")
+            .set("CompanyName", "Windmill Labs, Inc.")
+            .set("LegalCopyright", "Copyright Windmill Labs, Inc.")
+            .compile()
+            .expect("failed to embed the Windows version resource");
+    }
 }