fc-common: validation and roles modules

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Idc4d0743153c77b4dd915a95a603680f6a6a6964

crates/common/src/error.rs

@@ -42,6 +42,9 @@ pub enum CiError {
 
   #[error("Forbidden: {0}")]
   Forbidden(String),
+
+  #[error("Internal error: {0}")]
+  Internal(String),
 }
 
 pub type Result<T> = std::result::Result<T, CiError>;