Add support for more flexible container port exposing

Fixes #171 (Github Issue).

roles/matrix-riot-web/defaults/main.yml

@@ -4,7 +4,10 @@ matrix_riot_web_docker_image: "bubuntux/riot-web:v1.1.2"
 
 matrix_riot_web_data_path: "{{ matrix_base_data_path }}/riot-web"
 
-matrix_riot_web_container_expose_port: false
+# Controls whether the matrix-riot-web container exposes its HTTP port (tcp/8080 in the container).
+#
+# Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:8765"), or empty string to not expose.
+matrix_riot_web_container_http_host_bind_port: ''
 
 # A list of extra arguments to pass to the container
 matrix_riot_web_container_extra_arguments: []

roles/matrix-riot-web/tasks/validate_config.yml

@@ -8,9 +8,9 @@
   with_items:
     - "matrix_riot_web_default_hs_url"
 
-- name: (Deprecation) Catch and report renamed settings
+- name: (Deprecation) Catch and report renamed riot-web variables
   fail:
-    msg: >
+    msg: >-
       Your configuration contains a variable, which now has a different name.
       Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).
   when: "item.old in vars"
@@ -20,3 +20,4 @@
     - {'old': 'matrix_riot_web_homepage_template_technical', 'new': '<removed>'}
     - {'old': 'matrix_riot_web_homepage_template_building', 'new': '<removed>'}
     - {'old': 'matrix_riot_web_homepage_template_contributing', 'new': '<removed>'}
+    - {'old': 'matrix_riot_web_container_expose_port', 'new': '<superseded by matrix_riot_web_container_http_host_bind_port>'}

roles/matrix-riot-web/templates/systemd/matrix-riot-web.service.j2

@@ -17,8 +17,8 @@ ExecStart=/usr/bin/docker run --rm --name matrix-riot-web \
 			--cap-drop=ALL \
 			--read-only \
 			--network={{ matrix_docker_network }} \
-			{% if matrix_riot_web_container_expose_port %}
-			-p 127.0.0.1:8765:8080 \
+			{% if matrix_riot_web_container_http_host_bind_port %}
+			-p {{ matrix_riot_web_container_http_host_bind_port }}:8080 \
 			{% endif %}
 			--tmpfs=/tmp:rw,noexec,nosuid,size=10m \
 			-v {{ matrix_riot_web_data_path }}/nginx.conf:/etc/nginx/nginx.conf:ro \

roles/matrix-riot-web/vars/main.yml

@@ -1,3 +1,3 @@
 ---
 
-matrix_riot_web_embedded_pages_home_url: "{{ (none if matrix_riot_web_embedded_pages_home_path is none else 'home.html') }}"
+matrix_riot_web_embedded_pages_home_url: "{{ ('' if matrix_riot_web_embedded_pages_home_path is none else 'home.html') }}"