Simplify release and back-to-dev processes

[submarcos]

Description

Make easier release and back-to-dev processes

make release version=x.yyy.z

• update VERSION file content with x.yyy.z
• update debian/changelog with x.yyy.z version entry (use support geotrek mail to identify maintainer)
• update docs/changelog.rst '+dev (XXXX-XX-XX)' with specified version and current date.

make back_to_dev version=x.yyy.z

• update VERSION file content with x.yyy.z+dev
• update debian/changelog with x.yyy.z+dev UNRELEASED version entry (use support geotrek mail to identify maintainer)
• update docs/changelog.rst, add new entry with +dev and XXXX-XX-XX

Related Issue

Checklist

• I have followed the guidelines in our Contributing document
• My code respects the Definition of done available in the Development section of the documentation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes
• I added an entry in the changelog file
• My commits are all using prefix convention (emoji + tag name) and references associated issues
• I added a label to the PR corresponding to the perimeter of my contribution
• The title of my PR mentionned the issue associated

[cypress]

Geotrek-admin    Run #13499

Run Properties:   Passed #13499  •  77c119b9fe ℹ️: Merge c821090a5bd00c67bbbc794c07d1f19167da1196 into b7dbdbd9748858a47236513af55c...

Project	Geotrek-admin
Branch Review	refs/pull/4860/merge
Run status	Passed #13499
Run duration	02m 16s
Commit	77c119b9fe ℹ️: Merge c821090a5bd00c67bbbc794c07d1f19167da1196 into b7dbdbd9748858a47236513af55c...
Committer	Jean-Etienne Castagnede
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	22
View all changes introduced in this branch ↗︎

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.47%. Comparing base (991c19c) to head (c821090).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4860   +/-   ##
=======================================
  Coverage   98.47%   98.47%           
=======================================
  Files         273      273           
  Lines       22256    22256           
=======================================
  Hits        21916    21916           
  Misses        340      340           

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[Copilot]

Pull Request Overview

This PR simplifies the release and back-to-development processes by introducing two new Makefile targets that automate the manual steps previously required. The changes streamline version management, changelog updates, and Debian package configuration.

• Introduces make release version=x.y.z to automate version updates across VERSION file, debian/changelog, and docs/changelog.rst
• Adds make back_to_dev version=x.y.z to prepare the repository for next development cycle
• Updates documentation to reflect the new simplified workflow

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
Makefile	Adds new release and back_to_dev targets with automated version management
docs/contribute/guidelines.rst	Updates release documentation to use new Makefile targets