Update build OSes, pre-install Python (#4762) #81

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10 errors and 2 warnings

RPC failed; curl 92 HTTP/2 stream 3 was not closed cleanly: CANCEL (err 8)

18784 bytes of body are still expected

early EOF

fetch-pack: invalid index-pack output

RPC failed; curl 56 GnuTLS recv error (-9): Error decoding the received TLS packet.

12039 bytes of body are still expected

early EOF

fetch-pack: invalid index-pack output

RPC failed; curl 92 HTTP/2 stream 3 was not closed cleanly: CANCEL (err 8)

2071 bytes of body are still expected

Docker pull failed with exit code 1, back off 6.029 seconds before retry.

Docker pull failed with exit code 1, back off 1.405 seconds before retry.