Set ICINGA_BUILD_TYPE: snapshot again

24 jobs for master in 11 minutes and 14 seconds (queued for 3 seconds)
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build/rhel/8 Build
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build/centos/7 Build
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build/fedora/30 Build
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build/opensuse/15.0 Build
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build/sles/12.4 Build
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build/sles/15.0 Build
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build/fedora/29 Build
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