build: bump Alpine to v3.23

[lklimek]

Issue being fixed or feature implemented

New Alpine v3.23 was released, with EOL on 01 Nov 2027.

Current Alpine v3.21 has end of life 01 Nov 2026.

What was done?

Upgraded Alpine to 3.23.

How Has This Been Tested?

Local build with docker buildx build + green GHA https://github.com/dashpay/platform/actions/runs/21392162040

Breaking Changes

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

Summary by CodeRabbit

Release Notes

• Chores
  • Updated Docker syntax directive to version 1.21.
  • Updated Alpine Linux base image to version 3.23.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

The Dockerfile syntax directive is updated to version 1.21, and the Alpine Linux base image version is incremented from 3.21 to 3.23. These are version bumps affecting the build environment and dependencies.

Changes

Cohort / File(s)	Change Summary
Docker Configuration Dockerfile	Updated syntax directive from docker/dockerfile:1.7-labs to docker/dockerfile:1.21; incremented ALPINE_VERSION ARG from 3.21 to 3.23 in multiple declarations

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A Dockerfile freshly dressed,
With Alpine upgraded to the best!
Version 1.21, so shiny and new,
Building containers lighter than dew! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change in the changeset—bumping Alpine from v3.21 to v3.23 in the Dockerfile.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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