Add new API endpoints for push mirrors management (#19841)

- Add a new push mirror to specific repository
- Sync now ( send all the changes to the configured push mirrors )
- Get list of all push mirrors of a repository
- Get a push mirror by ID
- Delete push mirror by ID

Signed-off-by: Mohamed Sekour <mohamed.sekour@exfo.com>
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: zeripath <art27@cantab.net>

routers/api/v1/swagger/repo.go

@@ -345,6 +345,20 @@ type swaggerWikiCommitList struct {
 	Body api.WikiCommitList `json:"body"`
 }
 
+// PushMirror
+// swagger:response PushMirror
+type swaggerPushMirror struct {
+	// in:body
+	Body api.PushMirror `json:"body"`
+}
+
+// PushMirrorList
+// swagger:response PushMirrorList
+type swaggerPushMirrorList struct {
+	// in:body
+	Body []api.PushMirror `json:"body"`
+}
+
 // RepoCollaboratorPermission
 // swagger:response RepoCollaboratorPermission
 type swaggerRepoCollaboratorPermission struct {