GHA: Remove actions/checkout, fix apt commands, add retries on net errors #158
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GitHub actions/checkout@v3 is no longer working and v4 is incompatible with older Linux versions due to actions/checkout#1590. To fix this, and permanently eliminate the issue of periodic deprecation of actions/checkout, replace it with manual downloads of git snapshots using curl.
Additionally, fixed apt command lines that would incorrectly expand the list of packages to install. Added options to retry on network errors to reduce the probability of spurious CI failures. Also added git checkout parallel jobs to potentially speed up the checkout.
This should fix CI failures with actions/checkout@v3 and eliminate GHA deprecation warnings.