slapos_web_deploy: support Debian 12

Also remove support for very old OSes.
38 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS-Master.UnitTest-Master

02:27:34

passed SlapOS.Eggs.UnitTest-Master.Python2

00:17:50

failed SlapOS.Eggs.UnitTest-Master.Python3

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failed SlapOS-Master.UnitTest-Master

05:00:30

failed SlapOS-Master.UnitTest-Master

03:33:38

failed SlapOS-Master.UnitTest-Master

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failed SlapOS-Master.UnitTest-Master

06:28:54

failed SlapOS-Master.UnitTest-Master

02:05:10

failed SlapOS-Master.UnitTest-Master

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failed SlapOS-Master.UnitTest-Master

02:46:42

failed SlapOS-Master.UnitTest-Master

02:09:01

failed SlapOS-Master.UnitTest-Master

03:13:00

passed SlapOS.Eggs.UnitTest-Master.Python2

00:17:12

passed SlapOS.Eggs.UnitTest-Master.Python2

00:18:28

passed SlapOS.Eggs.UnitTest-Master.Python2

00:16:51

passed SlapOS.Eggs.UnitTest-Master.Python2

00:16:42

passed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python3

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failed SlapOS.Eggs.UnitTest-Master.Python3

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passed SlapOS.Eggs.UnitTest-Master.Python3

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passed SlapOS.Eggs.UnitTest-Master.Python3

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passed SlapOS.Eggs.UnitTest-Master.Python3

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failed SlapOS.Eggs.UnitTest-Master.Python3

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failed SlapOS.Eggs.UnitTest-Master.Python3

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failed SlapOS.Eggs.UnitTest-Master.Python3

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failed SlapOS.Eggs.UnitTest-Master.Python3

passed SlapOS.Eggs.UnitTest-Master.Python3

00:17:45

passed SlapOS.Eggs.UnitTest-Master.Python3

00:18:55

passed SlapOS.Eggs.UnitTest-Master.Python3

00:23:23

passed SlapOS.Eggs.UnitTest-Master.Python3

00:19:50

passed SlapOS.Eggs.UnitTest-Master.Python3

00:48:29