Make the paybutton server run on ARM64

[Fabcien]

There is no point hardcoding the platform, it only prevents the app from working on ARM64 which is not desirable.

Summary by CodeRabbit

• Chores
  • Updated the container base image to use the default Node LTS Alpine image instead of a platform-pinned variant.
  • Simplified the build setup with no other configuration changes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 09226d58-430e-4570-9e2e-9bee165310ba

📥 Commits

Reviewing files that changed from the base of the PR and between 525622e and a7d8fb1.

📒 Files selected for processing (1)

• Dockerfile

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📝 Walkthrough

Walkthrough

The Docker base image was changed from a platform-pinned Node Alpine image to the default node:lts-alpine image.

Changes

Docker base image update

Layer / File(s)	Summary
Base image update Dockerfile	The FROM line no longer pins linux/amd64 and now uses node:lts-alpine without a platform constraint.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 I hopped through the Docker mist,
and found a tidier alpine twist.
No platform pin, just a softer breeze,
keeping builds light with easy ease.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is too sparse and omits required template sections like Related to, Description, and Test plan.	Fill in the template sections: add the linked issue, a brief description of the change, and a test plan with validation steps.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: removing the platform pin to support ARM64.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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