Fix quoting inconsistencies in env vars

Greenlight treats all environment variables as case-sensitive strings. In
particular, boolean values "true" and "false" need to be lower-case, whereas
the string representation of YAML booleans uses "True" and "False". In order
to avoid harmful capitalization of boolean values, we need to quote them as
YAML strings.

defaults/main.yml

@@ -29,14 +29,14 @@ bbb_greenlight_db_name: greenlight_production
 bbb_greenlight_db_port: 5432
 bbb_greenlight_environment: {}
 bbb_greenlight_environment_defaults:
-  HELP_URL: https://docs.bigbluebutton.org/greenlight/gl-overview.html
-  ALLOW_GREENLIGHT_ACCOUNTS: true
-  DEFAULT_REGISTRATION: open
-  RELATIVE_URL_ROOT: /b
-  ROOM_FEATURES: mute-on-join,require-moderator-approval,anyone-can-start,all-join-moderator
-  PAGINATION_NUMBER: 25
-  NUMBER_OF_ROWS: 25
-  MAINTENANCE_MODE: false
+  HELP_URL: "https://docs.bigbluebutton.org/greenlight/gl-overview.html"
+  ALLOW_GREENLIGHT_ACCOUNTS: "true"
+  DEFAULT_REGISTRATION: "open"
+  RELATIVE_URL_ROOT: "/b"
+  ROOM_FEATURES: "mute-on-join,require-moderator-approval,anyone-can-start,all-join-moderator"
+  PAGINATION_NUMBER: "25"
+  NUMBER_OF_ROWS: "25"
+  MAINTENANCE_MODE: "false"
   DB_ADAPTER: "{{ bbb_greenlight_db_adapter }}"
   DB_HOST: "{{ bbb_greenlight_db_host }}"
   DB_PORT: "{{ bbb_greenlight_db_port }}"

templates/greenlight-docker-compose.yml.j2

@@ -11,7 +11,7 @@ services:
     environment:
 {% set bbb_greenlight_environment_combined = bbb_greenlight_environment_defaults | combine(bbb_greenlight_environment) -%}
 {% for envvar in bbb_greenlight_environment_combined %}
-      - {{ envvar }}={{ bbb_greenlight_environment_combined[envvar] }}
+      {{ envvar }}: "{{ bbb_greenlight_environment_combined[envvar] }}"
 {% endfor %}
     volumes:
       - {{ bbb_greenlight_logdir }}:/usr/src/app/log
@@ -29,7 +29,7 @@ services:
     volumes:
       - {{ bbb_greenlight_dbdir }}:/var/lib/postgresql/data
     environment:
-      - POSTGRES_DB={{ bbb_greenlight_db_name }}
-      - POSTGRES_USER="{{ bbb_greenlight_db_username }}"
-      - POSTGRES_PASSWORD="{{ bbb_greenlight_db_password }}"
+      POSTGRES_DB: "{{ bbb_greenlight_db_name }}"
+      POSTGRES_USER: "{{ bbb_greenlight_db_username }}"
+      POSTGRES_PASSWORD: "{{ bbb_greenlight_db_password }}"
 {% endif %}