Try to get rid of owned types

Inspired by https://www.youtube.com/watch?v=A4cKi7PTJSs. This turns a
lot of cloning Strings and PathBufs into Rcs.

src/artifacts/mod.rs

@@ -1,13 +1,24 @@
-use std::path::{Path as ActualPath, PathBuf};
+use std::path::{self, PathBuf};
+use std::rc::Rc;
 
 #[derive(Clone, Debug)]
-pub struct Path(PathBuf);
+pub struct Path(Rc<path::Path>);
 
-// FIXME: This is a specialization since with Path: Into<PathBuf>
+impl Path {
+  pub(crate) fn clone_rc(&self) -> Rc<path::Path> {
+    Rc::clone(&self.0)
+  }
+
+  pub fn join(&self, path: impl AsRef<path::Path>) -> Self {
+    Self::from(self.0.join(path))
+  }
+}
+
+// FIXME: This is a specialization since with Path: AsRef<path::Path>
 // it would overwrite impl<T> From <T> for T
-//impl<T: Into<PathBuf>> From<T> for Path {
+//impl<T: AsRef<path::Path>> From<T> for Path {
 //  fn from(v: T) -> Self {
-//    Path(v.into())
+//    Self(v.as_ref().into())
 //  }
 //}
 
@@ -15,7 +26,8 @@ macro_rules! path_from {
   ( $t:ty ) => {
     impl From<$t> for Path {
       fn from(v: $t) -> Self {
-        Self(v.into())
+        let path: &path::Path = v.as_ref();
+        Self(path.into())
       }
     }
   };
@@ -25,23 +37,35 @@ path_from!(String);
 path_from!(&str);
 path_from!(PathBuf);
 
-impl From<Path> for PathBuf {
+impl From<Rc<path::Path>> for Path {
+  fn from(v: Rc<path::Path>) -> Self {
+    Self(v)
+  }
+}
+
+impl AsRef<path::Path> for Path {
+  fn as_ref(&self) -> &path::Path {
+    &self.0
+  }
+}
+
+impl From<Path> for Rc<path::Path> {
   fn from(v: Path) -> Self {
     v.0
   }
 }
 
-impl AsRef<ActualPath> for Path {
-  fn as_ref(&self) -> &ActualPath {
-    &self.0
+impl From<&Path> for Rc<path::Path> {
+  fn from(v: &Path) -> Self {
+    v.0.clone()
   }
 }
 
 #[derive(Clone, Debug)]
-pub struct UserName(pub String);
+pub struct UserName(pub Rc<str>);
 
 #[derive(Clone, Debug)]
-pub struct ServiceName(pub String);
+pub struct ServiceName(pub Rc<str>);
 
 #[derive(Clone, Debug)]
-pub struct DatabaseName(pub String);
+pub struct DatabaseName(pub Rc<str>);