feat: add Weblate template

[enigma972]

What is this PR about?

New PR of Weblate

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.

Greptile Summary

This PR adds a new Weblate (web-based translation tool) template with Docker Compose services for Weblate, Valkey (Redis-compatible cache), and PostgreSQL 18. The template includes good security practices like read_only containers and tmpfs mounts, proper healthchecks, and correct volume paths for PostgreSQL 18+.

Key issues to address before merging:

• Self-referencing variables in template.toml: Multiple variables (e.g., POSTGRES_USER, POSTGRES_DB, POSTGRES_HOST, WEBLATE_SITE_TITLE, WEBLATE_SITE_DOMAIN, WEBLATE_ADMIN_NAME) reference themselves instead of providing actual default values, which will cause them to resolve to empty strings and likely break the deployment.
• Unpinned Docker image: weblate/weblate:latest should be pinned to a specific version (e.g., 5.11.2), and meta.json version field should match.
• Docker Compose version: Uses 3.9 instead of the project-standard 3.8.

Confidence Score: 2/5

• This PR has configuration issues that will likely cause deployment failures and should be fixed before merging.
• Score of 2 reflects that while the overall template structure is sound, the self-referencing variables in template.toml will result in empty/undefined values for critical settings like database credentials and host, which will break the deployment. The unpinned image tag also violates project guidelines.
• Pay close attention to blueprints/weblate/template.toml (self-referencing variables) and blueprints/weblate/docker-compose.yml (unpinned image tag).

_{Last reviewed commit: 626fdca}

Greptile also left 4 inline comments on this PR.

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Context used:

• Rule used - AGENTS.md (source)

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[greptile-apps]

Self-referencing variables resolve to empty values

Several variables in the [variables] section reference themselves (e.g., WEBLATE_SITE_TITLE = "${WEBLATE_SITE_TITLE}"), which will resolve to empty strings since no actual default is provided. This affects: WEBLATE_SITE_TITLE (line 9), WEBLATE_SITE_DOMAIN (line 10), WEBLATE_ADMIN_NAME (line 13), WEBLATE_EMAIL_HOST (line 14), WEBLATE_EMAIL_HOST_USER (line 15), WEBLATE_EMAIL_HOST_PASSWORD (line 16), WEBLATE_SERVER_EMAIL (line 17), POSTGRES_USER (line 22), POSTGRES_DB (line 23), and POSTGRES_HOST (line 24).

These should have sensible literal defaults. For example, other templates (like authentik and n8n-with-postgres) define values like POSTGRES_USER = "weblate", POSTGRES_DB = "weblate", and POSTGRES_HOST = "database" (matching the docker-compose service name). WEBLATE_SITE_DOMAIN should reference "${main_domain}", and WEBLATE_SITE_TITLE should have a literal default like "Weblate". WEBLATE_ADMIN_NAME could default to "Admin". Without these defaults, the deployment will likely fail or produce a misconfigured instance.

Rule Used: AGENTS.md (source)