The old act_runner engine (v0.2.13 on the delphi-ci runner) mishandles
actions/setup-python's PATH injection: pip installs coverage into the
toolcache interpreter while `python3` in later steps resolves back to the
image's system Python, so unit/coverage jobs failed with "No module named
coverage". Newer runners (TrueNAS's v0.6.1) don't, which is why it only
broke on delphi.
The runner-images/act container already ships Python 3.12, and the job
container is ephemeral, so drop setup-python entirely and install straight
into the system Python with --break-system-packages. Every step now uses
one interpreter consistently, on any runner version. Also removes the
redundant setup-python step from the integration job (stdlib-only).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UoEZHDjv84ChoZbozQERhJ
didericis
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