This appears to be a **major rebranding effort** from "Earthly" to
"Earthbuild". Here are the key changes:

- All references to "earthly" have been systematically changed to
"earthbuild" - Binary name changed from `earthly` to `earthbuild` -
Repository references updated from `earthly/earthly` to
`earthbuild/earthbuild` - Organization references changed from
"earthly-technologies" to "earthbuild-technologies" - Domain references
changed from `earthly.dev` to `earthbuild.dev`

- Updated all BuildKite, CircleCI, and GitHub Actions configurations -
Changed environment variables from `EARTHLY_*` to `EARTHBUILD_*` -
Updated download URLs to point to new repository locations - Modified
Docker registry mirrors and authentication

- Extensive updates to README files across the project - Updated
installation instructions and examples - Changed documentation
references throughout - Updated changelog to reflect the rebranding

- Deleted various configuration files (like
`.earthly_version_flag_overrides`, `.earthlyignore`) - Removed
cloud-related documentation and features - Cleaned up various CI
configuration files

- **Latest commit (44d53a6)**: "docs: Summary of Changes Made" -
**Previous work included**: - Independent CI setup (#1) - Fork testing
for examples (#38) - Removal of satellite CI references (#24) - Complete
removal of Cloud features (earthly#4325) - README clarification about fork
status (#4)

- Updated container names from `earthly-*` to `earthbuild-*` - Changed
secret organization references - Updated example repository references -
Modified installation scripts and bootstrap processes

This represents a **complete fork and rebranding** of the Earthly
project to create "Earthbuild" as an independent project. The changes
are comprehensive, touching every aspect of the codebase from build
scripts to documentation to maintain consistency with the new brand
identity.