fix: protect Unix-specific imports with cfg attributes

- Add #[cfg(unix)] to std::os::unix::fs::PermissionsExt imports
- Protect Unix-specific test functions with #[cfg(unix)]
- Fixes compilation on Windows by conditionally compiling Unix-only code
- Resolves GitHub Actions workflow failure on Windows runners

Affected files:
- src/e2e/tasks/setup_ssh_key.rs
- src/infrastructure/tofu/template/renderer/mod.rs
- src/infrastructure/ansible/template/renderer/inventory.rs
- src/domain/template/embedded.rs

All tests pass on Unix systems and code now compiles cross-platform.

Author: josecelano

src/domain/template/embedded.rs

@@ -225,6 +225,7 @@ impl TemplateManager {
 #[cfg(test)]
 mod tests {
     use super::*;
+    #[cfg(unix)]
     use std::os::unix::fs::PermissionsExt;
     use tempfile::TempDir;
 

src/e2e/tasks/setup_ssh_key.rs

@@ -16,6 +16,7 @@
 //! to prevent SSH client warnings and ensure secure key handling.
 
 use anyhow::{Context, Result};
+#[cfg(unix)]
 use std::os::unix::fs::PermissionsExt;
 use tempfile::TempDir;
 use tracing::info;

src/infrastructure/ansible/template/renderer/inventory.rs

@@ -388,6 +388,7 @@ mod tests {
         ));
     }
 
+    #[cfg(unix)]
     #[test]
     fn it_should_fail_when_output_directory_is_readonly() {
         let temp_dir = TempDir::new().expect("Failed to create temp directory");

src/infrastructure/tofu/template/renderer/mod.rs

@@ -511,6 +511,7 @@ mod tests {
     }
 
     // Error Handling Tests
+    #[cfg(unix)]
     #[tokio::test]
     async fn it_should_fail_when_directory_creation_denied() {
         // Create a read-only directory to simulate permission denied
@@ -593,6 +594,7 @@ mod tests {
         }
     }
 
+    #[cfg(unix)]
     #[tokio::test]
     async fn it_should_fail_when_file_copy_permission_denied() {
         let temp_dir = tempfile::TempDir::new().expect("Failed to create temp directory");