[temeteke]

Problem

The recently added tmux and Vim Feature manifests contain an unsupported readonly field in their mounts metadata. The existing devcontainers/action@v1 publishing workflow already validates Feature metadata during release.

The precise deploy job failure message has not been independently retrieved, so this is a confirmed schema defect rather than a proven root cause of the reported failure.

Changes

• Remove the unsupported readonly properties from the two Feature manifests.
• Update documentation to clearly state that these host config mounts are read-write; processes in the container may modify host files.
• Remove the separate PR-only validate workflow to keep CI minimal. Rely on the existing Release Dev Container Features workflow's built-in Feature packaging and metadata validation after merging.

Verification

• The modified manifests passed devcontainer features package ./src in the previous PR branch run, before the redundant workflow was removed.
• The release workflow must be checked after merging this PR.
• test/validate.sh remains available for manual JSON/Bash syntax checks.