Update gitea and create shell variable

The current gitea version is updated to 1.7.5.

And now you are able to customize the shell of your gitea user.
[Issue 14](https://github.com/thomas-maurice/ansible-role-gitea/issues/14)

defaults/main.yml

@@ -1,9 +1,10 @@
 ---
-gitea_version: "1.7.4"
+gitea_version: "1.7.5"
 
 gitea_app_name: "Gitea"
 gitea_user: "gitea"
 gitea_home: "/var/lib/gitea"
+gitea_shell: "/bin/false"
 
 gitea_user_repo_limit: -1
 

tasks/create_user.yml

@@ -4,4 +4,4 @@
     name: "{{ gitea_user }}"
     comment: "Gitea user"
     home: "{{ gitea_home }}"
-    shell: "/bin/false"
+    shell: "{{ gitea_shell }}"