Changes:

• Rename earth command to earthly
• New experimental feature: Shared caching
• New feature: Ability to reference builds hosted in private Git repositories
• New feature: Global ARGs (#593)
• Improvements to the Cloud Secrets experimental feature
• Improved cache reusability by eliminating file timestamps and making other file metadata more consistent
• Improved WITH DOCKER stability on WSL
• Improved error message reporting
• Allow comments in combination with line-continuations (#318)
• Certain progress updates now show up as progress bars
• Fix interactive mode in WITH DOCKER (#592)
• Fix for Earthfiles that contained no +base commands and no empty lines

Upgrading:

• Rename earth to earthly in all your scripts. The command earth is now sym-linked to point to earthly, but it can be safely removed after you have completely migrated.
• If you use the link https://github.com/earthly/earthly/releases/latest/download/earth-linux-amd64 to download earth in your CI, use a pinned version of Earthly instead in CI: https://github.com/earthly/earthly/releases/download/v0.4.0/earthly-linux-amd64. The former link will no longer work in the future.