[Rpm-maint] [rpm-software-management/rpm] Cache the base image in CI (PR #4319)

[Michal Domonkos]

@dmnks commented on this pull request.



> @@ -18,18 +18,39 @@ jobs:
 
     steps:
       - uses: actions/checkout at v3
+
+      - name: Restore cached base image
+        id: image-cache
+        uses: actions/cache at v6
+        with:
+          path: /tmp/image.tar

Okay, while I haven't found any specific info about the `/tmp` directory on (Ubuntu) runners, the [documentation](https://docs.github.com/en/actions/reference/workflows-and-actions/variables) does say:

> We strongly recommend that actions use variables to access the filesystem rather than using hardcoded file paths. GitHub sets variables for actions to use in all runner environments.

And surely enough, there's the `RUNNER_TEMP` environment variable that's automatically set on the runners and has the following description:

> The path to a temporary directory on the runner. This directory is emptied at the beginning and end of each job. Note that files will not be removed if the runner's user account does not have permission to delete them. For example, D:\a\_temp

So let's just use that. Thanks for pointing this out :+1: 

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