ci: bump OTP 28.0 -> 28.5.0.2 to unblock Hex 2.5.0#205
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Hex 2.5.0 (shipped 2026-06-29) calls :re.import/2, which only exists on
Erlang/OTP >= 28.1. CI pinned OTP 28.0, so the moment Hex 2.5.0 became the
latest, every job crashed at 'mix deps.get' with:
(MatchError) ... {:undef, [{:re, :import, ...}]}
This took master's own scheduled run red (06-29) while 06-27/06-28 were green
-- a pure toolchain regression, no code change involved. Elixir 1.19 also
requires OTP 28.1+, so the 28.0 pin was already below its own floor.
Move OTP forward to 28.5.0.2 (latest 28.x build available for the runner).
Elixir stays at 1.19.5 (current 1.19; satisfies mix.exs ~> 1.18). The env var
flows into every job's setup-beam and into the mix/PLT cache keys, so the bump
also correctly busts the stale OTP-28.0 caches.
mkreyman
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Jun 29, 2026
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Problem
CI went all-red on every PR (and master's own 06-29 scheduled run) starting 2026-06-29. Root cause is a toolchain regression, not code: Hex 2.5.0 shipped that day and calls
:re.import/2, which only exists on Erlang/OTP >= 28.1. CI pinned OTP 28.0, somix deps.getcrashes immediately:06-27 and 06-28 were green on the same pins — only Hex changed under us. Elixir 1.19 also officially requires OTP 28.1+, so the 28.0 pin was already below its own floor.
Fix
Bump
OTP_VERSION28.0 → 28.5.0.2 (latest 28.x build available for the Ubuntu runner). Elixir stays at 1.19.5 (current 1.19, satisfies mix.exs~> 1.18). The single env var flows into every job'ssetup-beamand the mix/PLT cache keys, so this also busts the stale OTP-28.0 caches.Verification
This PR's own CI run is the verification —
mix deps.getmust now succeed and the full matrix go green. Once merged, PR #204 (KnowledgeLintWorker) rebases on top to clear its (identical, toolchain-induced) red.