[Enhancement]: Allow template docker url to be modified via env

[aybruhm]

Description

This PR allows the UI templates got from Docker hub to be flexible by allowing proxies to list the image tags.

Related Issue

Closes 1964

Related PR

Closed Contributor's PR

Changes

• Update compose files to allow DOCKER_HUB_TEMPLATE_URL.
• Make use of DOCKER_HUB_TEMPLATE_URL in templates_manager.update_and_sync_templates function.

What to QA

• Run compose up and confirm that the templates are pulled from docker hub.
• Create an app from the UI templates, navigate to the playground and run the variant.

Acceptance Tests

• Ensure that templates are pulled and saved to the database.
• Ensure that created apps from the UI templates works.

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