Add platform attribute to docker services

[suecarmol]

Description

When trying to build and run TWL locally, I had the following error:

no matching manifest for linux/arm64/v8 in the manifest list entries

This is solved by adding platform: linux/amd64 to the db and web services.

Rationale

Adding this will help us run TWL locally.

Phabricator Ticket

N/A

How Has This Been Tested?

Screenshots of your changes (if appropriate):

Types of changes

What types of changes does your code introduce? Add an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Minor change (fix a typo, add a translation tag, add section to README, etc.)