postmoogle - add missing join()s

roles/custom/matrix-bot-postmoogle/templates/env.j2

@@ -15,12 +15,12 @@ POSTMOOGLE_TLS_CERT={{ matrix_bot_postmoogle_tls_cert }}
 POSTMOOGLE_TLS_KEY={{ matrix_bot_postmoogle_tls_key }}
 POSTMOOGLE_TLS_REQUIRED={{ matrix_bot_postmoogle_tls_required }}
 POSTMOOGLE_DATA_SECRET={{ matrix_bot_postmoogle_data_secret }}
-POSTMOOGLE_PROXIES={{ matrix_bot_postmoogle_proxies }}
+POSTMOOGLE_PROXIES={{ matrix_bot_postmoogle_proxies | join(' ') }}
 POSTMOOGLE_MONITORING_SENTRY_DSN={{ matrix_bot_postmoogle_monitoring_sentry_dsn }}
 POSTMOOGLE_MONITORING_SENTRY_RATE={{ matrix_bot_postmoogle_monitoring_sentry_rate }}
 POSTMOOGLE_MONITORING_HEALTHCHECKS_UUID={{ matrix_bot_postmoogle_monitoring_healthchecks_uuid }}
 POSTMOOGLE_MONITORING_HEALTHCHECKS_DURATION={{ matrix_bot_postmoogle_monitoring_healthchecks_duration }}
-POSTMOOGLE_MAILBOXES_RESERVED={{ matrix_bot_postmoogle_mailboxes_reserved }}
+POSTMOOGLE_MAILBOXES_RESERVED={{ matrix_bot_postmoogle_mailboxes_reserved | join(' ') }}
 POSTMOOGLE_MAILBOXES_ACTIVATION={{ matrix_bot_postmoogle_mailboxes_activation }}
 
 {{ matrix_bot_postmoogle_environment_variables_extension }}