Add support for tags.

src/discovery.rs

@@ -34,7 +34,7 @@ pub(crate) async fn discover_matching_push_triggers<RE: AsRef<str>>(
     remote_config: &RemoteConfig,
 ) -> Result<Vec<PipelineTemplate>, Box<dyn std::error::Error>> {
     let mut ret = Vec::new();
-    let ref_to_branch_regex = Regex::new(r"refs/heads/(?P<branch>.+)")?;
+    let ref_to_branch_regex = Regex::new(r"refs/(heads|tags)/(?P<branch>.+)")?;
     let captures = ref_to_branch_regex
         .captures(git_ref.as_ref())
         .ok_or("Could not find branch name.")?;