Allow db host, name user and password to be configurable

db/make_db.sh

@@ -1,6 +1,12 @@
-export PGUSER=postgres
-psql <<- EOSQL
-    CREATE DATABASE mattermost;
-    CREATE USER mmuser WITH PASSWORD 'mmuser_password';
-    GRANT ALL PRIVILEGES ON DATABASE mattermost to mmuser;
+#!/bin/bash
+set -e
+
+MM_USERNAME=${MM_USERNAME:-mmuser}
+MM_PASSWORD=${MM_PASSWORD:-mmuser_password}
+MM_DBNAME=${MM_DBNAME:-mattermost}
+
+psql -v ON_ERROR_STOP=1 --username "postgres" <<- EOSQL
+    CREATE DATABASE $MM_DBNAME;
+    CREATE USER $MM_USERNAME WITH PASSWORD '$MM_PASSWORD';
+    GRANT ALL PRIVILEGES ON DATABASE $MM_DBNAME to $MM_USERNAME;
 EOSQL