gitweb: Use drop-in config component for /etc files

Tests:

- Config files are all symlinks /etc/
- Configuration file is effective
- Web interface works
- Web interface authentication works

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

debian/freedombox.maintscript

@@ -87,3 +87,6 @@ rm_conffile /etc/plinth/modules-enabled/users 23.10~
 rm_conffile /etc/plinth/modules-enabled/wireguard 23.10~
 rm_conffile /etc/plinth/modules-enabled/wordpress 23.10~
 rm_conffile /etc/plinth/modules-enabled/zoph 23.10~
+rm_conffile /etc/gitweb-freedombox.conf 23.10~
+rm_conffile /etc/apache2/conf-available/gitweb-freedombox.conf 23.10~
+rm_conffile /etc/apache2/conf-available/gitweb-freedombox-auth.conf 23.10~

plinth/modules/gitweb/__init__.py

@@ -7,6 +7,7 @@ from django.utils.translation import gettext_lazy as _
 
 from plinth import app as app_module
 from plinth import frontpage, menu
+from plinth.config import DropinConfigs
 from plinth.modules.apache.components import Webserver
 from plinth.modules.backups.components import BackupRestore
 from plinth.modules.firewall.components import Firewall
@@ -35,7 +36,7 @@ class GitwebApp(app_module.App):
 
     app_id = 'gitweb'
 
-    _version = 2
+    _version = 3
 
     def __init__(self):
         """Create components for the app."""
@@ -68,6 +69,13 @@ class GitwebApp(app_module.App):
         packages = Packages('packages-gitweb', ['gitweb', 'highlight'])
         self.add(packages)
 
+        dropin_configs = DropinConfigs('dropin-configs-gitweb', [
+            '/etc/gitweb-freedombox.conf',
+            '/etc/apache2/conf-available/gitweb-freedombox.conf',
+            '/etc/apache2/conf-available/gitweb-freedombox-auth.conf'
+        ])
+        self.add(dropin_configs)
+
         firewall = Firewall('firewall-gitweb', info.name,
                             ports=['http', 'https'], is_external=True)
         self.add(firewall)