9f620d2819
Cache is keyed on the ESP-IDF version used in CI, so there shouldn't be any cache invalidation issues when ESP-IDF version changes. Restoring from cache takes approx 15s, compared to 2-3m to perform these steps (ESP-IDF tools install, ESP-IDF clone, ESP-IDF submodule clone) the first time. Cache size is approx 1.6GB, the git clone is tweaked as much as possible to keep the size down. Signed-off-by: Angus Gratton <angus@redyak.com.au>