Make GitHub Actions inputs consistent

[fredden]

While reviewing #101, I noticed that the way that GitHub Actions "inputs" were handled was not consistent across all Actions in this repository. This pull request aims to make them consistent.

Changes include:

• Rename ce_version and ce-version inputs to magento_version (maintaining backwards-compatibility)
• Allow specifying project_name where magento/project-community-edition was hard-coded. Note that not all instances of this are fixed here.
• Unset extra environment variables in action.yml files for inputs
• Handle input variables in entrypoint.sh scripts as intended
• Remove unused inputs: extension-name, extension-package-name

Changes are best viewed with "ignore white-space" as my editor has removed trailing white-space in several files. If you would prefer these to remain as-is, please let me know and I will update the pull request accordingly.

Fixes #82 Closes #101

[jissereitsma]

@fredden Awesome work so far. Indeed, the current workflows were initially setup by me and @fooman but we never got into "cleaning" things up. However, as you mention, the magento_version renaming is breaking. I'd rather just have both in there. This could simply mean that both variables are used, one being a fallback of the other. Something like this:

test -z "${MAGENTO_VERSION}" && MAGENTO_VERSION=${INPUT_MAGENTO_VERSION}
test -z "${MAGENTO_VERSION}" && MAGENTO_VERSION=${CE_VERSION}
test -z "${MAGENTO_VERSION}" && MAGENTO_VERSION=${INPUT_CE_VERSION}

It's a bit ugly and also elaborate, but that's what it takes to maintain backwards compatibility.

[fredden]

I will update this pull request to avoid the breaking change. I'll add some comments to show that ce-version and ce_version are deprecated.

[jissereitsma]

Awesome!

[fredden]

@jissereitsma @sprankhub I've made the changes to maintain backwards-compatibility. It was easier than I had expected.

[jissereitsma]

Good stuff! I forgot that some of the entry scripts were JS based (and not bash-based) but you picked up on that :) As far as I see, with this PR, things will not break and will definitely improve. I concur.

[jissereitsma]

Yup, I would say so. @fredden Very good stuff. Let's try to test this asap to see if things break :o