Initial Authentik setup with docker-compose

- Docker Compose configuration with PostgreSQL, Redis, server and worker
- Authentik version 2025.8.4 (latest stable)
- Gitea Actions workflow for automated deployment
- Environment configuration template
- Directory structure for media, templates and certificates

.gitignore

@@ -0,0 +1,22 @@
+# Environment variables
+.env
+
+# Authentik data directories
+media/
+certs/
+
+# Docker volumes data (if using local binding)
+postgresql-data/
+redis-data/
+
+# Logs
+*.log
+
+# Temporary files
+*.tmp
+*.bak
+*~
+
+# OS files
+.DS_Store
+Thumbs.db