chore: manually downloads Earthly instead of using abandoned GHA #805

Job	Run time
ci / discover	3m 23s
ci / check / ./cli+check	38s
ci / check / ./foundry/api+check	57s
ci / check / ./foundry/operator+check	1m 33s
ci / check / ./lib/project+check	46s
ci / check / ./lib/schema+check	48s
ci / check / ./lib/schema+check-gen	51s
ci / check / ./lib/tools+check	36s
ci / build / ./cli+build	39s
ci / build / ./docs+build	39s
ci / build / ./foundry/api+build	39s
ci / build / ./foundry/operator+build	38s
ci / package	1s
ci / test	1s
ci / nightly	1s
ci / docs	1s
ci / release	1s
ci / deploy	1s
ci / final	1s
	12m 14s

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