Remove deprecation warnings and make author configurable

What's Changed

• Update use of set-output to environment file. by @creachadair in #146
• Configurable gh author by @hfrSchmidt in #154
• Test 154 and upgrade CI by @helaili in #155

New Contributors

• @creachadair made their first contribution in #146
• @hfrSchmidt made their first contribution in #154

Full Changelog: 2.4.0...2.5.0

2.4.0

What's Changed

• Allow override of bundler version or resolve from lock file by @inverse in #114
• Add .ruby-version by @inverse in #131
• Added the BUILD_DIR flag by @ThaumicMekanism in #82

New Contributors

• @inverse made their first contribution in #114
• @ThaumicMekanism made their first contribution in #82

Full Changelog: v2.3...2.4.0

Fix branch detection and default push

What's Changed

• Handle branch detection by @helaili in #123
• Git repo data is missing by @helaili in #124

Full Changelog: v2.3...2.3.1

2.3.0

What's Changed

• Publish to selected path by @helaili in #85
• Improve testing

Full Changelog: 2.2...2.3.0

Default branch detection

Previous version was expecting a master branch

Changing auth and allow pre-build commands

Now using a token parameter that can be set to GITHUB_TOKEN.
You can specify pre_build_commands so that you can further customize the environment.

No Gemfile.lock!

Solve many issues by not requiring a Gemfile.lock file.
Added a build_only parameter
Added a jekyll_build_options parameter
Add a jekyll_env parameter
Worked a lot on testing

Config gemfile source and target branch

Merge pull request #51 from gamue/target_branch

Add option to configure target branch

A bit more logging info

2.0.3

left over echo

Migration to sh... for real this time

Several fixes following a halfway migration to sh