Added Docker to Database Getting Started

Signed-off-by: Andre Wanlin <awanlin@spotify.com>

docs/getting-started/config/database.md

@@ -6,13 +6,13 @@ description: How to set up PostgreSQL for your Backstage instance.
 
 Audience: Admins
 
-### Summary
+## Summary
 
 This guide walks through how to set up a PostgreSQL database to host your Backstage data. It assumes you've already have a scaffolded Backstage app from following the [Standalone Install](../index.md) guide.
 
 By the end of this tutorial, you will have a working PostgreSQL database hooked up to your Backstage install.
 
-### Prerequisites
+## Prerequisites
 
 This guide assumes a basic understanding of working on a Linux based operating system and have some experience with the terminal, specifically, these commands: `apt-get`, `psql`, `yarn`.
 
@@ -23,7 +23,7 @@ This guide assumes a basic understanding of working on a Linux based operating s
 - If the database is not hosted on the same server as the Backstage app, the
   PostgreSQL port needs to be accessible (the default is `5432` or `5433`)
 
-### 1. Install and configure PostgreSQL
+## 1. Install and configure PostgreSQL
 
 :::tip Already configured your database?
 
@@ -68,17 +68,27 @@ That's enough database administration to get started. Type `\q`, followed by
 pressing the enter key. Then again type `exit` and press enter. Next, you need
 to install and configure the client.
 
-### 2. Configuring Backstage `pg` Client
+### Docker Alternative
 
-Go to the root directory of your freshly installed Backstage
-App. Run the following to install the PostgreSQL client into your backend:
+Alternatively you can run Postgres in a Docker container, this is great for local development or getting a Backstage POC up and running quickly, here's how:
 
-```bash title="From your Backstage root directory"
-yarn --cwd packages/backend add pg
+First we need to pull down the container image, we'll use Postgres 17, check out the [Postgres Version Policy](../../overview/versioning-policy.md#postgresql-releases) to learn which versions as supported.
+
+```shell
+docker pull postgres:17.0-bookworm
 ```
 
-Use your favorite editor to open `app-config.yaml` and add your PostgreSQL
-configuration in the root directory of your Backstage app using the credentials from the previous steps.
+Then we just need to start up the container.
+
+```shell
+docker run -d --name postgres --restart=always -p 5432:5432 -e POSTGRES_PASSWORD=<secret> postgres:17.0-bookworm
+```
+
+This will run Postgres in the background for you, but remember to start it up again when you reboot your system.
+
+## 2. Configuring Backstage `pg` Client
+
+Use your favorite editor to open `app-config.yaml` and add your PostgreSQL configuration in the root directory of your Backstage app using the credentials from the previous steps.
 
 ```yaml title="app-config.yaml"
 backend:
@@ -136,3 +146,4 @@ If you want to read more about the database configuration, here are some helpful
 
 - [Configuring Plugin Databases](../../tutorials/configuring-plugin-databases.md#privileges)
 - [Read more about Knex](http://knexjs.org/), the database wrapper that we use.
+- [Install pgAdmin 4](https://www.pgadmin.org/), a helpful tool for querying your database.