Add template file for tutorial pages

[ehogan]

Description

• Closes Add template file for tutorial pages #4452
• Link to documentation: https://esmvaltool--4456.org.readthedocs.build/en/4456/tutorials/template.html

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[ehogan]

I tried following the instructions provided by "🛠 Any changed dependencies have been added or removed correctly" but I got:

 WARN the lock file is up-to-date but uses an older format (v6), re-solving all environments using locked content to upgrade to v7
Error:   × failed to solve requirements of environment 'test-py312' for platform 'osx-arm64'
  ├─▶   × a coalesced request failed
  │   
  ╰─▶ other error

@bouweandela would it be possible for you to help with this, please? 🤞

[bouweandela]

@bouweandela would it be possible for you to help with this, please? 🤞

I can't reproduce it. Maybe try updating pixi with pixi self-update and rerunning?

[rbeucher]

Hi all — we’re getting ready for the next ESMValTool release, version 2.15, and are planning to freeze the code on 26 June 2026.

Could you please let us know whether you think you’ll be able to finalise the work in this PR by then? If not, no problem — it would just help us plan what can realistically make it into the release.

@flicj191 tagging Felicity for visibility.

[bouweandela]

@ehogan I've run pixi lock for you and committed the result, so you should at least be able to continue working on this.