Add Podman container infrastructure role for containerized services

- Implemented complete Podman infrastructure role following rick-infra patterns
- Minimal installation approach: only install podman, trust Arch dependency management
- Configured with crun runtime for optimal performance and security
- Security-focused: HTTPS-only registries, rootless containers, systemd hardening
- Registry support: docker.io, quay.io, ghcr.io with secure configurations
- Ready for service-specific users with isolated container environments
- Quadlet support for native systemd container management
- Container-to-host networking via bridge networks with host gateway access
- Foundation for future containerized services (Authentik, Nextcloud)
- Maintains rick-infra philosophy: infrastructure provides foundation, apps manage specifics

roles/podman/templates/registries.conf.j2

@@ -0,0 +1,35 @@
+# Container Registry Configuration - Generated by Ansible
+# rick-infra Podman Infrastructure Role
+#
+# This configuration defines trusted container registries
+# for secure container image retrieval
+
+# =================================================================
+# Registry Search Configuration
+# =================================================================
+
+# Default registries to search when pulling unqualified image names
+# Images without a registry prefix will search these in order
+unqualified-search-registries = {{ podman_registries | to_json }}
+
+{% for registry in podman_registries %}
+# =================================================================
+# {{ registry | title }} Registry Configuration
+# =================================================================
+
+[[registry]]
+location = "{{ registry }}"
+insecure = {{ podman_registry_insecure | lower }}
+blocked = {{ podman_registry_blocked | lower }}
+
+{% endfor %}
+
+# =================================================================
+# Security Notes
+# =================================================================
+# All registries configured with:
+# - insecure: false (HTTPS required)
+# - blocked: false (registry accessible)
+# 
+# Additional registries can be added by applications as needed
+# following the same security-first configuration pattern