env_vars create/update should support is_buildtime and is_runtime flags

[StuMason]

Context

When creating or updating environment variables via the env_vars tool, there's no way to control the is_buildtime and is_runtime flags. All vars default to is_buildtime: true, is_runtime: true.

This causes a hard failure when setting multiline values (like PEM keys for PASSPORT_PRIVATE_KEY) because Coolify injects build-time vars as ARG directives in the Dockerfile, and multiline values break the Dockerfile parser:

Dockerfile:11
--------------------
 9 |     ARG DB_CONNECTION=pgsql
10 |     ARG PASSPORT_PRIVATE_KEY=-----BEGIN PRIVATE KEY-----
11 | >>> MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggko...
--------------------
ERROR: failed to build: dockerfile parse error on line 11: unknown instruction

Expected behaviour

The create and update actions on env_vars should accept optional is_buildtime and is_runtime boolean parameters, defaulting to the current behaviour if not provided.

{
  "action": "create",
  "resource": "application",
  "uuid": "...",
  "key": "PASSPORT_PRIVATE_KEY",
  "value": "-----BEGIN PRIVATE KEY-----\n...",
  "is_buildtime": false,
  "is_runtime": true
}

Workaround

Currently the only way to set a runtime-only variable is via the Coolify web UI.

[StuMason]

@claude can you put in a PR from here to fix this?

[claude]

Claude finished @StuMason's task in 3m 11s —— View job • claude/issue-135-20260303-0903 • Create PR ➔

---

Completed: Added is_build_time parameter to env_vars tool

• Gather context and understand existing implementation
• Update MCP tool definition in src/lib/mcp-server.ts
• Run tests and verify changes (262 tests passing)
• Update documentation (CHANGELOG.md)
• Commit and push changes
• Provide PR link

Summary:
Added is_build_time optional boolean parameter to the env_vars tool for create and update actions. This allows setting is_build_time: false to create runtime-only environment variables, avoiding Dockerfile ARG injection issues with multiline values like PEM keys.

Example usage:

{
  "action": "create",
  "resource": "application",
  "uuid": "...",
  "key": "PASSPORT_PRIVATE_KEY",
  "value": "-----BEGIN PRIVATE KEY-----\n...",
  "is_build_time": false
}

Note: The Coolify API uses a single is_build_time boolean (not separate is_buildtime/is_runtime flags). Setting is_build_time: false makes the variable runtime-only.

--- ·