Add deps and build cache for CI runs

palavatv / signaltower

Signaling server for WebRTC video-/audio conferencing using the palava protocol

https://palava.tv

GNU General Public License v3.0

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Closed paulgoetze closed 4 years ago

paulgoetze commented 4 years ago

Fixes #19

Caches dependencies and dependency builds (excluding the signal_tower files)
Dialyzer picks up existing PLT files (which are written to _build/dev/), which are cached in the build cache step
Caches are invalidated by changes in the mix.lock file.
Brings down the CI run time from >10 min to ~33 sec (see test PR and last action runs in https://github.com/paulgoetze/signaltower/actions)