feat: add OpenObserve template

[andrew-tinekov]

What is this PR about?

New PR of OpenObserve – a cloud-native observability platform that unifies logs, metrics, and traces into one solution.

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.

Screenshots or Videos

Greptile Summary

This PR adds a new OpenObserve template — a cloud-native observability platform for logs, metrics, and traces. The overall structure is sound, but the docker-compose.yml has several violations of the project's documented conventions (AGENTS.md) that need to be addressed before merging.

Key issues:

• Missing version: "3.8" — AGENTS.md requires this as the first line of every docker-compose.yml.
• ports used instead of expose — AGENTS.md explicitly prohibits ports in templates; expose must be used instead. Using ports maps container ports to the host, bypassing Dokploy's network isolation.
• Unpinned Docker image (latest tag) — AGENTS.md requires pinning images to specific versions to prevent supply chain attacks and ensure deployment reproducibility. The "version": "latest" in meta.json should also be updated to match the pinned tag once chosen.
• Minor: ZO_HTTP_PORT and ZO_GRPC_PORT are threaded through as env vars unnecessarily; since they are static values, they can be hardcoded directly in expose.

Confidence Score: 2/5

• Not safe to merge until the ports→expose fix, missing version: "3.8", and image pinning are addressed.
• Three concrete convention violations from AGENTS.md are present in the docker-compose.yml: missing version declaration, prohibited ports directive, and unpinned image tag. These are straightforward fixes but required by the project's own guidelines before the template can be merged.
• blueprints/openobserve/docker-compose.yml requires all three fixes; meta.json needs the version updated once the image is pinned.

_{Reviews (1): Last reviewed commit: "feat: add openobserve template" | Re-trigger Greptile}

Greptile also left 4 inline comments on this PR.

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Context used:

• Context used - AGENTS.md (source)

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[andrew-tinekov]

About Validate and Process Meta.json – not related to my changes:

[2026-03-23T19:35:23.228Z] 🔧 Starting meta.json processing...
[2026-03-23T19:35:23.230Z] 🔧 Found 389 total entries
[2026-03-23T19:35:23.231Z] ⚠️ Duplicate ID found: "strapi" (Strapi)
[2026-03-23T19:35:23.234Z] ✅ Processing completed in 6ms
[2026-03-23T19:35:23.234Z] 🔧 Statistics:
[2026-03-23T19:35:23.234Z] 🔧   • Original entries: 389
[2026-03-23T19:35:23.234Z] 🔧   • Duplicates removed: 1
[2026-03-23T19:35:23.234Z] 🔧   • Final entries: 388
[2026-03-23T19:35:23.234Z] 🔧   • Schema violations: 0
[2026-03-23T19:35:23.234Z] ⚠️ Removed duplicates:
[2026-03-23T19:35:23.234Z] ⚠️   • "strapi" (Strapi)