Remove jobs on ubuntu-18.04 and add Homebrew workaround #1382
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The ubuntu-18.04 GitHub Actions image has been removed (see https://github.blog/changelog/2022-08-09-github-actions-the-ubuntu-18-04-actions-runner-image-is-being-deprecated-and-will-be-removed-by-12-1-22/), so we can just remove the related jobs from the CI. Note that anyhow we still have Ubuntu 18.04 CI coverage (see #481) thanks to the Docker bionic CI job.
Furthermore, I added the n-th workaround for Homebrew CI, to fix #1383 .