Awscurl

* Add docker builds for arm64

Bug fix:
* address homebrew issue

Fixes:
* Credentials issue introduced in 0.27.0 when running on EC2 instance (https://github.com/okigan/awscurl/issues/163)

* Set exit code based on HTTP request status - this provides better integration with other command line tools

Feature updates

drop python 2.7 support
update URL encode non-alpha query string parameters
Developer experience

add/update dockerhub workflow
add Github (ghcr) docker registry publishing
add gitpod linking to simplify external contributions

Minor feature release:
* Merge use CaseInsensitiveDict for headers (72 )