Use init.sh to create stellar user and core/horizon db at startup

Author: talawahtech

Dockerfile

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+FROM postgres:9.6
+
+COPY init.sh /docker-entrypoint-initdb.d/

init.sh

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+#!/bin/bash
+set -ue
+
+psql -v ON_ERROR_STOP=1 --username "${POSTGRES_USER}" <<-EOSQL
+    CREATE USER ${STELLAR_DB_USER} WITH PASSWORD '${STELLAR_DB_PASSWORD}';
+    CREATE DATABASE core;
+    CREATE DATABASE horizon;
+    GRANT ALL PRIVILEGES ON DATABASE core TO ${STELLAR_DB_USER};
+    GRANT ALL PRIVILEGES ON DATABASE horizon TO ${STELLAR_DB_USER};
+EOSQL