feat: gix clone with --ref support.

`--ref` is similar to `--branch`, but was renamed as it also supports
tags for example.

Author: Byron

Diff for: gitoxide-core/src/repository/clone.rs

@@ -6,6 +6,7 @@ pub struct Options {
     pub handshake_info: bool,
     pub no_tags: bool,
     pub shallow: gix::remote::fetch::Shallow,
+    pub ref_name: Option<gix::refs::PartialName>,
 }
 
 pub const PROGRESS_RANGE: std::ops::RangeInclusive<u8> = 1..=3;
@@ -31,6 +32,7 @@ pub(crate) mod function {
             handshake_info,
             bare,
             no_tags,
+            ref_name,
             shallow,
         }: Options,
     ) -> anyhow::Result<()>
@@ -75,6 +77,7 @@ pub(crate) mod function {
         }
         let (mut checkout, fetch_outcome) = prepare
             .with_shallow(shallow)
+            .with_ref_name(ref_name.as_ref())?
             .fetch_then_checkout(&mut progress, &gix::interrupt::IS_INTERRUPTED)?;
 
         let (repo, outcome) = if bare {

Diff for: src/plumbing/main.rs

@@ -404,6 +404,7 @@ pub fn main() -> Result<()> {
             handshake_info,
             bare,
             no_tags,
+            ref_name,
             remote,
             shallow,
             directory,
@@ -413,6 +414,7 @@ pub fn main() -> Result<()> {
                 bare,
                 handshake_info,
                 no_tags,
+                ref_name,
                 shallow: shallow.into(),
             };
             prepare_and_run(

Diff for: src/plumbing/options/mod.rs

@@ -434,6 +434,10 @@ pub mod clone {
         /// The url of the remote to connect to, like `https://github.com/byron/gitoxide`.
         pub remote: OsString,
 
+        /// The name of the reference to check out.
+        #[clap(long = "ref", value_parser = crate::shared::AsPartialRefName, value_name = "REF_NAME")]
+        pub ref_name: Option<gix::refs::PartialName>,
+
         /// The directory to initialize with the new repository and to which all data should be written.
         pub directory: Option<PathBuf>,
     }