setup-action

Sets up GitHub Actions for ESP32 projects — building ESP-IDF firmware in a pinned container, taking the version from the git tag, proving a published image is the variant it claims to be, and publishing artefacts and a release when a tag is pushed. Also covers the pre-merge gate: lint plus the tests a hosted runner can actually run, and which tiers it cannot reach. Use this skill whenever CI comes up for an ESP32 or…