fix(linkstack): make timezone configurable and remove invalid mounts

[madhuragrawal]

What is this PR about?

New PR of linkstack

This PR improves the Linkstack template by:

• Exposing timezone as a configurable variable instead of a static default
• Removing invalid volume mounts from template.toml that caused validation failures

The Docker Compose configuration already defines volumes, so removing the mounts from
template.toml aligns the template with repository conventions.

Checklist

Before submitting this PR, please make sure that:

• I have read the suggestions in the README.md file https://github.com/Dokploy/templates?tab=readme-ov-file#general-requirements-when-creating-a-template
• I have tested the template in my instance, so the maintainers don't spend time trying to figure out what's wrong.
• I have added tests that demonstrate that my correction works or that my new feature works.

No automated tests exist for templates; change verified via manual deployment.

Issues related (if applicable)

N/A

Greptile Summary

Made timezone configurable and fixed template validation issues

• Replaced hardcoded Europe/Berlin timezone with configurable timezone variable (defaults to UTC)
• Removed invalid mount configurations from template.toml that lacked required serviceName field
• Volumes remain properly configured in docker-compose.yml

Confidence Score: 5/5

• Safe to merge - fixes validation issues and improves configurability
• Changes correctly address template validation failures by removing invalid mount configurations, make timezone user-configurable with a sensible default, and maintain all existing functionality. Volumes are properly defined in docker-compose.yml.
• No files require special attention

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