Add option to add stats to Job Summary page

[planetmarshall]

Adds a job-summary option that adds the stats to the Job Summary section of a workflow run. Requires CCache 4.10+

Also added some unit tests and a workflow job for same.

Just added cache hits for now but is easily extendable. - looks like this:

[hendrikmuhs]

Nice!

Do you see a reason why somebody would decide against this? I understand the need for the version check. Given that the version supports it, I would enable it. Or do I miss anything? Is there a usecase for disabling the output?

[planetmarshall]

Nice!

Do you see a reason why somebody would decide against this?

No problem. Just being conservative - I'll update the PR enabling the feature by default.

[TrentHouliston]

I've done something similar for a private repo, Something that I found looks really good is to use a mermaid diagram to show the direct/preprocessed/missed stats in a pie chart diagram.

https://mermaid.js.org/syntax/pie.html

Since the summaries support github flavoured markdown they render right in the summary view!

e.g.

pie showData title CCache Summary
    "Direct Hits" : 149818
    "Preprocessed Hits" : 1840
    "Misses" : 3743

pie showData title CCache Summary
    "Direct Hits" : 149818
    "Preprocessed Hits" : 1840
    "Misses" : 3743

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[hendrikmuhs]

@planetmarshall Thanks again for the contribution. I think this ready to be merged, however I meanwhile merged some dependabot PRs and caused a merge conflict.

Shall I fix it myself or can you?
I also wonder, do you want to lock into the suggestion from @TrentHouliston? Or is that something for a follow up? - I definitely like the idea and support it, however it could be done in a separate change.

[planetmarshall]

@planetmarshall Thanks again for the contribution. I think this ready to be merged, however I meanwhile merged some dependabot PRs and caused a merge conflict.

Shall I fix it myself or can you?

I've updated the branch.

I also wonder, do you want to lock into the suggestion from @TrentHouliston? Or is that something for a follow up? - I definitely like the idea and support it, however it could be done in a separate change.

I like the the idea but I think it's better added as a future enhancement.