add start-postgres composite action#7
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Installs postgres directly on the runner via apt-get and starts it on
localhost:5432 with trust auth. Drop-in for `services: { postgres: ... }`
on ARC runners (where the docker daemon isn't available).
Inputs: version (default 16), database (optional createdb), password
(optional, only if client code wants a literal).
markatto
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Jun 1, 2026
The chown ran before apt-get install. Works on GH-hosted images (postgres user baked in) but fails on the minimal ARC runner image — `postgresql-N` postinst is what creates the user. Moves chown after install. #7 verified only on hosted; first downstream ARC caller (lightsparkdev/webdev#27434) hit `chown: invalid user: 'postgres:postgres'`.
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PE-171
Reusable shim for
services: { postgres: ... }on ARC runners, which can't useservices:(no docker daemon). Installs postgres via apt-get, starts it on localhost:5432 with trust auth.Inputs:
version(default"16"),database(optional createdb),password(optional ALTER USER; only if client code reads a literal).Verified working: https://github.com/lightsparkdev/.github/actions/runs/26787381168