Include support for GitHub Container Registry (#21)

You can now use GitHub Docker for either the GitHub Package Registry or the GitHub Container Registry

Update documentation

Removed Changelog.md as that information will be archived in releases.
Added badge and update note to README.md

Changelog.md | 10 ----------
README.md    |  4 ++++
2 files changed, 4 insertions(+), 10 deletions(-)

Fix buildArgs -> buildArg (#16)

Documentation showed the `buildArg` input used as `buildArgs`. Very confusing as it's unclear which one is right. Now only one is shown; `buildArg`.

Co-authored-by: Dawid Dziurla <dawidd0811@gmail.com>

Update README.md

Update README.md

Update README.md

Update README.md

Merge pull request #5 from matootie/feature/minimal-input

Reduce required input

Update README to reflect newcoming version

README.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Include license file

LICENSE | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)