Add build SHA to panic reports and zed --version (on nightly/dev) (#24258)

Release Notes:

- N/A

crates/cli/build.rs

@@ -1,3 +1,5 @@
+use std::process::Command;
+
 fn main() {
     if std::env::var("ZED_UPDATE_EXPLANATION").is_ok() {
         println!(r#"cargo:rustc-cfg=feature="no-bundled-uninstall""#);
@@ -8,4 +10,18 @@ fn main() {
         // Weakly link ScreenCaptureKit to ensure can be used on macOS 10.15+.
         println!("cargo:rustc-link-arg=-Wl,-weak_framework,ScreenCaptureKit");
     }
+
+    // Populate git sha environment variable if git is available
+    println!("cargo:rerun-if-changed=../../.git/logs/HEAD");
+    if let Some(output) = Command::new("git")
+        .args(["rev-parse", "HEAD"])
+        .output()
+        .ok()
+        .filter(|output| output.status.success())
+    {
+        let git_sha = String::from_utf8_lossy(&output.stdout);
+        let git_sha = git_sha.trim();
+
+        println!("cargo:rustc-env=ZED_COMMIT_SHA={git_sha}");
+    }
 }