Prepare Kalendartool for MPM and disable invites

docker/postgres/init/01-app-user.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+set -eu
+
+: "${CALENDAR_DB_PASSWORD:?CALENDAR_DB_PASSWORD must be configured}"
+
+psql -v ON_ERROR_STOP=1 \
+  --username "$POSTGRES_USER" \
+  --dbname "$POSTGRES_DB" \
+  -v calendar_db_password="$CALENDAR_DB_PASSWORD" <<'SQL'
+SELECT format('CREATE ROLE calendar_app LOGIN PASSWORD %L', :'calendar_db_password')
+WHERE NOT EXISTS (SELECT 1 FROM pg_roles WHERE rolname = 'calendar_app')
+\gexec
+
+GRANT CONNECT ON DATABASE calendar TO calendar_app;
+GRANT USAGE, CREATE ON SCHEMA public TO calendar_app;
+SQL