fix gitea version extraction

tasks/prepare.yml

@@ -6,7 +6,7 @@
       register: gitea_installed
 
     - name: Get running version
-      shell: "{{ gitea_base_dir }}/gitea-latest -v | rev | cut -d ' ' -f6 | rev"
+      shell: "{{ gitea_base_dir }}/gitea-latest -v | perl -pe '($_)=/([0-9]+([.][0-9]+)+)/'"
       register: gitea_current
       changed_when: False
       when: gitea_installed.stat.exists