ci: add jlumbroso/free-disk-space to ./github/workflows/test.yml

[dj8yfo]

this says it clears additional 27 GB

[dj8yfo]

@race-of-sloths include

[race-of-sloths]

@dj8yfo Thank you for your contribution! Your pull request is now a part of the Race of Sloths!
Are you going to win race-of-sloths this month? If so, you should speed up! Run, Sloth, run!

Current status: executed

Reviewer	Score
@akorchyn	2

Your contribution is much appreciated with a final score of 2!
You have received 23 (20 base + 15% lifetime bonus) Sloth points for this contribution

@akorchyn received 25 Sloth Points for reviewing and scoring this pull request.

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[akorchyn]

@race-of-sloths 2