feat(go): improve cold start of 200ms by building outside of nsjail

backend/windmill-worker/nsjail/run.go.config.proto

@@ -58,38 +58,14 @@ mount {
     options: "size=500000000"
 }
 
+
 mount {
-    src: "{JOB_DIR}/go.sum"
-    dst: "/tmp/go/go.sum"
+    src: "{JOB_DIR}/main"
+    dst: "/tmp/go/main"
     is_bind: true
     mandatory: false
 }
 
-mount {
-    src: "{JOB_DIR}/go.mod"
-    dst: "/tmp/go/go.mod"
-    is_bind: true
-}
-
-mount {
-    src: "{JOB_DIR}/main.go"
-    dst: "/tmp/go/main.go"
-    is_bind: true
-    mandatory: false
-}
-
-mount {
-    src: "{JOB_DIR}/inner/inner_main.go"
-    dst: "/tmp/go/inner/inner_main.go"
-    is_bind: true
-}
-
-mount {
-    src: "{JOB_DIR}/inner/runner.go"
-    dst: "/tmp/go/inner/runner.go"
-    is_bind: true
-}
-
 mount {
     src: "{JOB_DIR}/args.json"
     dst: "/tmp/go/args.json"

backend/windmill-worker/src/worker.rs

@@ -1151,6 +1151,18 @@ func Run(req Req) (interface{{}}, error){{
                 .replace("{SHARED_MOUNT}", shared_mount),
         )
         .await?;
+        let build_go = Command::new(go_path)
+            .current_dir(job_dir)
+            .env_clear()
+            .env("PATH", path_env)
+            .env("BASE_INTERNAL_URL", base_internal_url)
+            .env("GOPATH", GO_CACHE_DIR)
+            .env("HOME", home_env)
+            .args(vec!["build", "main.go"])
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped())
+            .spawn()?;
+        handle_child(&job.id, db, logs, timeout, build_go).await?;
 
         Command::new(nsjail_path)
             .current_dir(job_dir)
@@ -1158,14 +1170,7 @@ func Run(req Req) (interface{{}}, error){{
             .envs(reserved_variables)
             .env("PATH", path_env)
             .env("BASE_INTERNAL_URL", base_internal_url)
-            .args(vec![
-                "--config",
-                "run.config.proto",
-                "--",
-                go_path,
-                "run",
-                "main.go",
-            ])
+            .args(vec!["--config", "run.config.proto", "--", "/tmp/go/main"])
             .stdout(Stdio::piped())
             .stderr(Stdio::piped())
             .spawn()?