[feature] Added support for Ubuntu 26.04 #633

[nemesifier]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Reference to Existing Issue

Closes #633

Description of Changes

Added support for Ubuntu 26.04.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 56a58060-fd94-445f-8064-f00511cfc909

📥 Commits

Reviewing files that changed from the base of the PR and between cc5ecab and 281d141.

📒 Files selected for processing (1)

• tasks/freeradius.yml

📜 Recent review details

⏰ Context from checks skipped due to timeout. (5)

• GitHub Check: Build ubuntu2204
• GitHub Check: Build ubuntu2404
• GitHub Check: Build debian13
• GitHub Check: Build debian12
• GitHub Check: Build ubuntu2604

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📓 Path-based instructions (2)

**/*.{yml,yaml,j2}

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Files:

• tasks/freeradius.yml

**/*.{yml,yaml,j2,sh}

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Files:

• tasks/freeradius.yml

🔇 Additional comments (1)

tasks/freeradius.yml (1)

47-47: LGTM!

Also applies to: 62-75

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📝 Walkthrough

Walkthrough

This pull request adds Ubuntu 26.04 (codename resolute) support to the ansible-openwisp2 role. Changes include a new vars/ubuntu-26.yml file with package overrides, a conditional include in tasks/main.yml, a new FreeRADIUS APT repository task for resolute in tasks/freeradius.yml, an added ubuntu2604 entry in the CI build matrix and molecule local platforms, a new Ubuntu version entry in meta/main.yml's galaxy_info.platforms, and documentation updates across README.md, docs/index.rst, docs/user/system-requirements.rst, docs/developer/installation.rst, and a whitespace normalization in docs/user/role-variables.rst.

Estimated code review effort: 2 (Simple) | ~15 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Ansible as Ansible Playbook
  participant TasksMain as tasks/main.yml
  participant VarsFile as vars/ubuntu-26.yml
  participant FreeRadiusTask as tasks/freeradius.yml

  Ansible->>TasksMain: run role tasks
  TasksMain->>TasksMain: check distribution == Ubuntu, release == resolute
  TasksMain->>VarsFile: include_vars ubuntu-26.yml
  VarsFile-->>TasksMain: package variable overrides
  Ansible->>FreeRadiusTask: run FreeRADIUS setup
  FreeRadiusTask->>FreeRadiusTask: check release == resolute
  FreeRadiusTask->>FreeRadiusTask: write networkradius.list APT source

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Related issues: #633

Suggested labels: enhancement, documentation, ci

Suggested reviewers: nemesifier, jieter

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Caution

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

• Ignore

❌ Failed checks (1 error)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	❌ Error	Formatting-only edits in docs/user/role-variables.rst and tasks/freeradius.yml are unrelated to Ubuntu 26.04 support.	Remove or split out the unrelated formatting-only changes so the PR stays focused on Ubuntu 26.04 support.

✅ Passed checks (7 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is descriptive, uses an allowed type, and clearly matches the Ubuntu 26.04 support change.
Description check	✅ Passed	It includes the required checklist, issue reference, and change summary; only the screenshot section is missing.
Linked Issues check	✅ Passed	The CI, docs, Galaxy metadata, and Ubuntu 26.04-specific task/vars updates satisfy #633's support request.
Bug Fixes	✅ Passed	N/A: this PR adds Ubuntu 26.04 support and docs/CI/metadata updates; it doesn’t fix a core bug, so regression-test requirements don’t apply.
Features	✅ Passed	Issue #633 exists and is assigned/boarded to org member nemesifier; docs and CI/molecule updates add Ubuntu 26.04 support.
Changes	✅ Passed	Docs/README/system requirements updated; CI/Molecule add Ubuntu 26.04 coverage, and no UI or public API changes were introduced.
General Rules	✅ Passed	PASS: Issue #633 is properly triaged, and the PR consistently updates CI/docs/Molecule/vars/metadata for Ubuntu 26.04 with no obvious security, perf, or naming issues.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issues/633-ubuntu-26.04

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