Docker Support

[hettiger]

I prefer to use this tool via Docker for historical reasons. (conflicting PHP versions etc.)
Docker support would also make this tool interesting for devs that don't use PHP.
If you push this to Docker Hub, installation is quite simple:

# e.g. ~/.zprofile
changelogger () {
  docker run --rm -it -v $(PWD):/app churchtools/changelogger changelogger $@
}

In this case I suggest updating the README.md as follows:

...
or run via docker.

# e.g. ~/.profile
changelogger () {
  docker run --rm -it -v $(PWD):/app churchtools/changelogger changelogger $@
}

[obstschale]

first of all thx for this PR. I use docker, but I'm not a pro in this field.

I see more and more packages using githubs registry. Why using Hub instead?

[hettiger]

first of all thx for this PR. I use docker, but I'm not a pro in this field.

No worries; thank you for looking into this PR nonetheless.

I see more and more packages using githubs registry. Why using Hub instead?

I think it doesn't really matter where the image is being published.
If you don't publish the image you can merge this as is.
If you publish the image to GitHub registry or Docker Hub it would make sense to update:

• README.md
• composer.json script "docker:build": "docker build -t churchtools/changelogger ."

It's not a strict requirement to publish the image though.

I executed the steps described in the README.md file.
Since then I've been using the local built docker image.

However, it's obviously much more convenient if theres a pre-built image.