chore(deps): update dependency earthly/earthly to v0.7.8

[renovate]

This PR contains the following updates:

Package	Update	Change
earthly/earthly	patch	0.7.7 -> 0.7.8

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Release Notes

earthly/earthly

v0.7.8

Compare Source

Added

• Add a new command docker-build to build a docker image using a Dockerfile without using an Earthfile, locally or on a satellite.

Changed

• FROM DOCKERFILE will use a .dockerignore file when using a build context from the host system and both .earthlyignore and .earthignore do not exist. Enable with VERSION --use-docker-ignore 0.7.

Fixed

• Fixed upstream race condition bug in buildkit, which resulted in failed to solve: unknown blob sha256:<...> in history errors. #​3000

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