Three major improvements:
1. Rootless Docker refactor: Removes docker/binary modes, unifies to
rootless Docker with per-runner system users. Each runner gets its
own rootless Docker daemon, systemd user service, and isolated
environment. Simplifies CLI (removes --mode option), Ansible role
(single code path), and molecule scenarios (removes binary scenario).
2. Auto-merge fix: Fixes status check context mismatch in branch
protection (was requiring "lint", "unit-tests", "molecule-tests" but
actual contexts are "CI / quality", "CI / molecule-tests*"). Adds
retry/wait logic to auto_merge.py that polls commit statuses for up
to 15 minutes before attempting merge, eliminating the chicken-and-egg
problem where auto-merge would fail because CI hadn't completed yet.
3. Molecule platform matrix: Adds OS platform matrix to CI — all 6
scenarios now run on all 4 supported OSes (ubuntu-2204, ubuntu-2404,
debian-12, archlinux) = 24 test pairs distributed across 3 parallel
runners. Updates distribute_molecule.py to distribute (scenario,
platform) pairs. Updates Makefile with molecule-all target for
local multi-platform testing.
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>