Add config option to be able to access database outside of container

roles/matrix-postgres/defaults/main.yml

@@ -15,3 +15,11 @@ matrix_postgres_docker_image_latest: "{{ matrix_postgres_docker_image_v11 }}"
 
 # A list of extra arguments to pass to the container
 matrix_postgres_container_extra_arguments: []
+
+# Controls whether the matrix-postgres container exposes a port (tcp/5432 in the
+# container) that can be used to access the database with psql.
+#
+# psql postgresql://username:password@localhost:<port>/database_name
+#
+# Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:5432"), or empty string to not expose.
+matrix_postgres_container_postgres_bind_port: ""

roles/matrix-postgres/templates/systemd/matrix-postgres.service.j2

@@ -17,6 +17,9 @@ ExecStart=/usr/bin/docker run --rm --name matrix-postgres \
 			--tmpfs=/tmp:rw,noexec,nosuid,size=100m \
 			--tmpfs=/run/postgresql:rw,noexec,nosuid,size=100m \
 			--network={{ matrix_docker_network }} \
+			{% if matrix_postgres_container_postgres_bind_port %}
+			-p {{ matrix_postgres_container_postgres_bind_port }}:5432 \
+			{% endif %}
 			--env-file={{ matrix_postgres_base_path }}/env-postgres-server \
 			-v {{ matrix_postgres_data_path }}:/var/lib/postgresql/data:rw \
 			-v /etc/passwd:/etc/passwd:ro \