feat: add matched files to output

[nbrugger-tgm]

Gives the developer the option to use (or even iterate) over the list of changed files

[tony84727]

LGTM and thank you for the contribution!
Do you mind adding a test for the new output variable {ruleName}_files?
I'm thinking of adding a check of the new variable here:

Case: When the rule matched files are not modified, the value of the variable should be empty (right?).

changed-file-filter/.github/workflows/test.yml

Lines 27 to 28 in 970b98c

	- name: Check Output
	run: '[[ "${{ steps.filter.outputs.test }}" = "false" ]]'

and here:

Case: When the rule matched files are modified, the value should be a space-separated list of rule matched changed files.

changed-file-filter/.github/workflows/test.yml

Lines 52 to 53 in 970b98c

	- name: Check Output
	run: '[[ "${{ steps.filter.outputs.test }}" = "true" ]]'

I realized it's not convenient to write tests in github action like that. I was thinking of moving the integration test cases from github workflow to jest if possible.

So whether to add the tests in this PR is up to you, or you can leave it to me.

[nbrugger-tgm]

Hi, I can indeed add tests in form of the test-workflow you posted.
Will have a look into how to do it and add it to this PR.

And yes testing GitHub actions is pain indeed and a problem i also didn't managed to solve

[nbrugger-tgm]

Functionality applied in repo: https://github.com/nbrugger-tgm/java-spring-template/pull/16#issuecomment-962558123

[tony84727]

Merged, Thank you!