Decide what to do with the Docker image versions section in the .tool-versions file

[stefaniuk]

What is the problem this feature will solve?

Currently, the recommendation is to use the .tool-versions file to store versions of the toolchain dependencies, which include dependencies specific to the built-in functionality of the repository template. This comes with the problem of unclear ownership of this file.

• See PR Improve make config behaviour #133

What is the feature that you are proposing to solve the problem?

Move the dependency versions for the repository template out of the .tool-versions file.

What alternatives have you considered?

The options are:

• Keep them where they are and use the update-from-template-app automated process to introduce and reconcile changes.
• Create a separate versions file for the dependencies of the repository template.
• Store the versions inline in the scripts where they are required.

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