App Platform will provide and host the URL for your SCIM bridge; you will not need to setup an A record or prepare a name for a URL as noted in PREPARATION.md
App Platfom will host the SCIM application for a low cost of $5/mo. An additional $5/mo or $6/mo will be utilized for the Droplet created for the Redis container. If you will be using a managed redis database, an additional $15/mo will be charged.
There's no need to manage the container that the SCIM bridge will be running on.

Preparation and Deployment

To get started with deploying the SCIM bridge using App Platform, you'll need:

Access to your organization's DigitalOcean tenant.
Access to your organization's Github account in order to fork this repository.
Access to create a Droplet for Redis in your organization's DigitalOcean tenant.

Step One: Setting up Redis

Before you deploy the SCIM bridge application using App Platform, a redis database must be created first, so that you can add the connection details for your database to the application at setup. There are two options for setting up a redis database: creating a Droplet in DigitalOcean and installing redis onto it or using DigitalOcean's Managed Redis database solution.

To create a Droplet:

Under Manage in the left-hand navigation menu, select Droplet or select the Create dropdown menu in the top right corner of your DigitalOcean tenant and select Droplet.
Choose an image for your container.
Choose a plan for your Droplet. (The Basic (shared CPU) tier is sufficient, but choose what's best for your organization)
Choose a datacenter region.
Under Finalize and Create, you will only need 1 Droplet.
Once you've configured the other settings on this page to your liking, click Create Droplet.

Once the creation process of your Droplet is complete:

Click on the hostname of your new container from your list of Droplets.
Click on Console. (ensure that the credentials for your image are set and that you can log into the container)
At this point, you will want to install redis on your Droplet. DigitalOcean provides detailed documentaion on how to install redis on each of its provided images. Documentation can be found here
For the Binding to Localhost step in the redis documentation, you will want to ensure that you allow all connections initially, so that the SCIM application can make a connection to your Droplet. After the successful deployment of your SCIM application, you can lock down access to your redis Droplet, ensuring that your SCIM application only has access to that Droplet.

If you prefer to use DigitalOcean's Managed Redis Database solution:

Under Manage in the left-hand navigation menu, select Databases or select the Create dropdown menu in the top right corner of your DigitalOcean tenant and select Databases.
Choose Redis as your Database Engine.
Under Choose your Configuration, leaving the Machine Type set to the Basic Nodes option is sufficient.
Choose a Datacenter.
Once you've configured the other settings on this page to your liking, click Create a Database Cluster.

Once the creation process of your managed database is complete:

Click on the hostname of your new container from your list of managed databases.
In the top right corner, click on the Actions dropdown menu and select Connection details.
Under the Public Network settings, you will need to take note of the hostname as well as the provided port number.
You can secure your database's inbound connections using DigitalOcean's Getting Started tutorial or by selecting Secure this database cluster by restricting access under the Trusted Sources section on the Overview page. You will want to complete this step after you've successfully deployed the application in Step Two, so that you can add the ip address of the application's container to that section.

Step Two: Building and Deploying using App Platform

Now that a redis Droplet has been created, you can start the deployment process of the SCIM application. Be sure that you have forked this repo before continuing:

Setting up the forked repo:

Under Manage in the left-hand navigation menu, select Apps or select the Create dropdown menu in the top right corner of your DigitalOcean tenant and select Apps.
Select Launch Your App on the splash page. If you've already started using Apps, select Create App in the top right corner of the page.
Choose Github as your source. (You may be prompted to walk through an authorization process for your Github account and your DigitalOcean tenant)
Choose the repository that contains the files for the DigitalOcean App Platform deployment.
Choose the corresponding branch.
You can choose to allow or deny Autodeploy code changes.
Click Next.

NOTE: DigitalOcean will notify you that it cannot find an app in the repo. This is due to the fact that App Platform expects the Dockerfile to be located at the root of the repo. In this case, the Dockerfile is located in the digitalocean-app-platform directory and we need to specify that source directory in App Platform.

Add digitalocean-app-platform after the / in the Source Directory field and select Find Directory

App Configuration:

To configure your app, you will need to set two environment variables: OP_REDIS_URL and OP_SESSION.
If you are using a Droplet, OP_REDIS_URL should contain the following: redis://[ip or hostname of redis Droplet]:6379
If you are using DigitalOcean's managed database solution, OP_REDIS_URL should contain the following: redis://[ip or hostname of redis Droplet]:[provided port number]
OP_SESSION should contain the base64 encoded version of your scimsession file. Run the following command in a terminal to generate the scimsession in a base64 encoded format: cat /path/to/scimsession| base64 | tr -d "\n"
The base64 encoded version of your scimsession should be returned in the terminal. Copy and paste the contents and paste them as the value of the OP_SESSION variable. (Do not copy the % sign at the end of the contents.)
Set the HTTP port for the app to 3002.
Click Next.
Name your application.
Select a region for the application/container.
Click Next.

Selecting Your Tier:

The Basic tier of App Platform is suffient enough for the SCIM bridge.
Under Containers, the Basic Size is defaulted to the 1 GB RAM | 1 vCPU option, however the 512 MB RAM | 1 vCPU option is sufficient for this deployment.
Number of Containers should be set to 1.
Select Launch Basic App.

Deployment:

The App will begin the build and deploy process but the build will fail. This is related to the Dockerfile not being located at the root of the repo as mentioned earlier. Although the dockerfile_path is correctly specified in the deploy.template.yaml file, this is only provided to DigitalOcean's app detection system and not the build system.

In order to provide the build system with the correct path:

Click on Settings from the Apps Dashboard.
Scroll down to App Spec.
Download the App Spec.
Edit the file by updating the dockerfile_path value to /digitalocean-app-platform/Dockerfile
Upload your file by clicking the Upload button in the App Spec section.

The build process will automatically restart from here.

Once complete, you should be notified that the app Deployed Successfully and the URL for the SCIM bridge will be made available on the Apps Dashboard. (You may need to refresh your page if the URL is not yet visible at this point)
Ensure that you add the provided URL and the bearer token to your IdP and test the connection.
Click the URL link and enter the bearer token for your SCIM bridge to start Provisioning tasks.