fix: use JSON kind for devcontainer updatecli targets

[gounthar]

Summary

Fixes the updatecli workflow failure by temporarily disabling the devcontainer dependency update pipeline that was blocking all updatecli runs.

Problem

After fixing the YAML syntax errors in PR #1843, updatecli started failing on the devcontainer dependency update configuration:

ERROR: could not find value for query "..." from file ".devcontainer/devcontainer.json"

Root Cause

The devcontainer.json file uses feature keys with special characters (dots, slashes, colons):

{
  "features": {
    "ghcr.io/devcontainers/features/docker-in-docker:2": {
      "version": "v27.0.3"
    },
    "ghcr.io/devcontainers/features/github-cli:1": {
      "version": "v2.83.1"
    }
  }
}

Updatecli cannot reliably target these nested fields regardless of approach:

• JSON kind with JSONPath: Bracket notation fails to locate values
• YAML kind with yamlpath: Complains about invalid characters
• File kind with content blocks: Pattern matching is unreliable

Solution

Temporarily disable the problematic pipeline by:

1. Renaming devcontainer.yaml to devcontainer.yaml.disabled
2. Adding devcontainer.yaml.README.md explaining:
   • The technical issue
   • Manual update process
   • Potential future solutions
   • How to re-enable when fixed

This allows the other 7 updatecli pipelines to function correctly while documenting the limitation for future maintainers.

Impact

• Fixes updatecli workflow on the weekly branch
• Devcontainer Docker and GitHub CLI versions will need manual updates until a solution is found
• All other dependency updates (Jenkins, Maven, Node, Debian, ssh-agent, etc.) continue to work automatically

Manual Update Process

Until resolved, devcontainer versions should be updated manually:

1. Check https://github.com/moby/moby/releases for Docker
2. Check https://github.com/cli/cli/releases for GitHub CLI
3. Update .devcontainer/devcontainer.json
4. Test in Codespaces

Future Solutions

• Wait for updatecli to improve special character handling
• Consider custom script outside updatecli
• Restructure devcontainer.json (would require devcontainer spec changes)