add function to init mas database

abra.sh

@@ -12,6 +12,13 @@ export MAS_CONFIG_VERSION=v1
 export PG_BACKUP_VERSION=v2
 export ADMIN_CONFIG_VERSION=v1
 
+ensure_mas_database () {
+    if ! psql -U synapse -d postgres -v ON_ERROR_STOP=1 -Atqc "SELECT 1 FROM pg_database WHERE datname = 'mas'" | grep -qx 1
+    then
+        psql -U synapse -d postgres -v ON_ERROR_STOP=1 -c "CREATE DATABASE mas OWNER synapse"
+    fi
+}
+
 set_admin () {
     admin=akadmin
     if [ -n "$1" ]