add init database

postgres/docker-entrypoint-initdb.d/.gitignore

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+*.sh

postgres/docker-entrypoint-initdb.d/createdb.sh.example

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+#!/bin/bash
+#
+# Copy createdb.sh.example to createdb.sh
+# then uncomment then set database name and username to create you need databases
+#
+# example: .env POSTGRES_USER=appuser and need db name is myshop_db
+# 
+#    psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+#        CREATE USER $POSTGRES_USER;
+#        CREATE DATABASE myshop_db;
+#        GRANT ALL PRIVILEGES ON DATABASE myshop_db TO $POSTGRES_USER;
+#    EOSQL
+#
+# this sh script will auto run when the postgres container starts and the $DATA_PATH_HOST/postgres not found.
+#
+
+set -e
+# psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+#     CREATE USER db1;
+#     CREATE DATABASE db1;
+#     GRANT ALL PRIVILEGES ON DATABASE db1 TO db1;
+# EOSQL
+
+# psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+#     CREATE USER db2;
+#     CREATE DATABASE db2;
+#     GRANT ALL PRIVILEGES ON DATABASE db2 TO db2;
+# EOSQL
+
+# psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+#     CREATE USER db3;
+#     CREATE DATABASE db3;
+#     GRANT ALL PRIVILEGES ON DATABASE db3 TO db3;
+# EOSQL