feat(cli): include stderr in command error

.changes/include-stderr-error.md

@@ -0,0 +1,7 @@
+---
+"@tauri-apps/cli": patch:enhance
+"tauri-cli": patch:enhance
+"tauri-bundler": patch:enhance
+---
+
+When a captured command fails, include its stderr in the error message.

crates/tauri-bundler/src/utils/mod.rs

@@ -102,9 +102,10 @@ impl CommandExt for Command {
     if output.status.success() {
       Ok(output)
     } else {
-      Err(crate::Error::GenericError(format!(
-        "failed to run {program}"
-      )))
+      Err(crate::Error::CommandFailed {
+        command: program,
+        error: std::io::Error::other(String::from_utf8_lossy(&output.stderr).to_string()),
+      })
     }
   }
 }

crates/tauri-cli/src/lib.rs

@@ -411,10 +411,10 @@ impl CommandExt for Command {
     if output.status.success() {
       Ok(output)
     } else {
-      crate::error::bail!(
-        "failed to run command `{cmdline}`: command exited with status code {}",
-        output.status.code().unwrap_or(-1)
-      );
+      Err(crate::error::Error::CommandFailed {
+        command: cmdline,
+        error: std::io::Error::other(String::from_utf8_lossy(&output.stderr).to_string()),
+      })
     }
   }
 }