Separate out the "DROP" sql code. In docker, it results an error "cannot drop the currently open database".

create_db.sql

@@ -1,9 +1,3 @@
-DROP DATABASE IF EXISTS card_db;
-CREATE DATABASE card_db;
-
-DROP USER IF EXISTS cardapp;
-CREATE USER cardapp WITH PASSWORD 'database_password';
-
 \c card_db;
 
 CREATE TABLE settings (

create_db_init.sql

@@ -0,0 +1,2 @@
+DROP DATABASE IF EXISTS card_db;
+CREATE DATABASE card_db;

create_db_user.sql

@@ -0,0 +1,2 @@
+DROP USER cardapp;
+CREATE USER cardapp WITH PASSWORD 'database_password';

s_create_db

@@ -12,7 +12,9 @@ echo Continue? "(y or n)"
 read x
 
 if [ "$x" = "y" ]; then
+	psql postgres -f create_db_init.sql
 	psql postgres -f create_db.sql
+	psql postgres -f create_db_user.sql
 	psql postgres -f settings.sql
 	echo Database created
 else

select_db.sql

@@ -0,0 +1 @@
+SELECT 'CREATE DATABASE card_db' WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'card_db');