feat: add support for github enterprise server (#132)

Update CircleCI config to sign MacOS binaries (#137)

* Sign MacOS builds

* Move build-and-deploy to separate steps

* Don't run build when its not a release

* Use v2.1 of circleci

* Fix build args

Use v2.1 of circleci

Bump go to 1.18 (#128)

Add support for git-xargs registered environment variables based on a…

…rguments and flags (#127)

* Register env vars based on arguments and flags

Closes #115

These changes add support for git-xargs registered environment variables
based on arguments and flags intended for use by the commands and
scripts called by git-xargs.  These environment variables start with
`XARGS_` to avoid collision with other use cases and include:

- `XARGS_REPO_NAME`: the name of the repository targeted
- `XARGS_DRY_RUN`: whether `--dry-run` flag was provided

Additionally, these changes contain a basic test to ensure this feature
works as expected going forward.

* README documentation, repository owner env var

While updating documentation, I realized that the original intent of
issue 115 might require the repository owner information as well as the
repository name.  This expands the initial changes and performs some
minor refactoring.

Bump go-git to v5.6.1 (#123)

Bump CircleCI Go to version 1.18 (#122)

Bump go to version 1.18

[skip ci] Refactor contexts (#117)

Clean up temporary clone paths by default (#113)

- Add flag (--keep-cloned-repositories) to preserve them

Correct readme referencing incorrect flag name: --max-pull-request-re…

…tries -> --max-pr-retries (#107)

Correct references to flag / make language more consistent