Add .github, docker, etc to export-ignore list

[sasezaki]

Description

With this PR, The archive targets other than src/ will be as follows:

git archive --format=tar HEAD | tar -tf - | grep -v src/
MAINTENANCE-TERMS.md
SECURITY.md
composer.json

Motivation and context

reduce dist size

How has this been tested?

Check if there are only files that are likely to be needed as a library

git archive --format=tar HEAD | tar -tf -

Screenshots (if appropriate)

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
  • Since it's only an exclusion of development files, I don't think it will have any impact, but if you think it's BC that it's not included from the dist, please let me know

Checklist:

Go over all the following points, and put an x in all the boxes that apply.

Please, please, please, don't send your pull request until all of the boxes are ticked. Once your pull request is created, it will trigger a build on our continuous integration server to make sure your tests and code style pass.

• I have read the CONTRIBUTING document.
• My pull request addresses exactly one patch/feature.
• I have created a branch for this patch/feature.
• Each individual commit in the pull request is meaningful.
• I have added tests to cover my changes.
• If my change requires a change to the documentation, I have updated it accordingly.

If you're unsure about any of these, don't hesitate to ask. We're here to help!

[Crell]

I am well behind on getting that file up to date on all of my projects... Thanks. 😄

[sasezaki]

@Crell could you release new tag for this and #44 ?