adding postgres container config

Author: sjanssen2

.gitignore

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+environments/db.env

compose.podman.yaml

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+version: '1'
+
+services:
+  keycloak-db:
+    image: postgres:15
+    container_name: keycloak-db
+    hostname: keycloak-db
+    restart: unless-stopped
+    env_file:
+      - ./environments/db.env
+    volumes:
+      - './environments/db-init.sh:/docker-entrypoint-initdb.d/db-init.sh'
+      - 'postgres-data:/var/lib/postgresql/data'
+
+volumes:
+  postgres-data:
+    name: keycloak-postgres-data

environments/db-init.sh

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+#!/bin/bash
+
+set -e
+set -u
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" "$POSTGRES_DB" <<-EOSQL
+	    CREATE USER "$KEYCLOAK_DB_USER" WITH password '$KEYCLOAK_DB_PASS';
+	    CREATE DATABASE "$KEYCLOAK_DB_NAME";
+      ALTER DATABASE "$KEYCLOAK_DB_NAME" OWNER TO "$KEYCLOAK_DB_USER"
+EOSQL

environments/db.env.example

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+POSTGRES_DB=postgres
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres
+
+KEYCLOAK_DB_NAME=keycloak
+KEYCLOAK_DB_USER=keycloak
+KEYCLOAK_DB_PASS=keycloak