Added documentation and examples for multitenancy setups.

examples/multitenancy/host_vars/server1/firewall.yml

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+# Firewall
+firewall_disable_ufw: true
+firewall_flush_rules_and_chains: true
+firewall_additional_rules:
+  - "iptables --policy INPUT DENY"
+firewall_allowed_tcp_ports:
+  - "22"
+  - "80"
+  - "443"
+  # Jitsi
+  - "4443" # tenant_a
+  - "4543" # tenant_b
+firewall_allowed_udp_ports:
+  # Jitsi
+  - "10000" # tenant_a
+  - "11000" # tenant_b

examples/multitenancy/host_vars/server1/server1.yml

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+# General settings
+ansible_user: deploy
+update_hostname: yes
+hostname: "multitenant-server1"
+users: []
+sudoers: []

examples/multitenancy/host_vars/server1/traefik.yml

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+# Traefik proxy
+traefik_letsencrypt_email: max@example.com
+traefik_install_user: "{{ default_user }}"
+traefik_expose_internally: True
+traefik_expose_externally: False
+traefik_enable_acme: True
+traefik_use_acme_staging: False
+traefik_dns_challenge_provider: False