Add GitHub Sync - Automated repository synchronization tool

Complete implementation of automated GitHub repository synchronization:
- Webhook-based auto-sync from GitHub
- Multi-repository support with branch selection
- Web dashboard for management
- Manual sync and rollback functionality
- Comprehensive logging and monitoring

Located in /gitpusher/ subdirectory as standalone application.

gitpusher/data/.htaccess

@@ -0,0 +1,8 @@
+# Deny all access to data directory
+Require all denied
+
+# Alternative for older Apache versions
+<IfModule !mod_authz_core.c>
+    Order deny,allow
+    Deny from all
+</IfModule>