ci: Update build matrix

20 jobs for master in 50 minutes and 8 seconds (queued for 5 seconds)
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build/ubuntu/xenial Build
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build/debian/buster Build
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build/ubuntu/bionic Build
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build/ubuntu/disco:x86 Build
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build/ubuntu/disco Build
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build/debian/stretch:x86 Build
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build/debian/stretch Build
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build/ubuntu/bionic:x86 Build
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build/ubuntu/xenial:x86 Build
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build/debian/buster:x86 Build
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