CI: have binary check emit offenders

[Habbie]

Short description

example output (original, will expire):

modules/tinydnsbackend/data.cdb:                                application/octet-stream; charset=binary
Error: Process completed with exit code 1.

Checklist

I have:

• [x] read the CONTRIBUTING.md document
• [x] compiled this code
• [x] tested this code
• [ ] included documentation (including possible behaviour changes)
• [ ] documented the code
• [ ] added or modified regression test(s)
• [ ] added or modified unit test(s)
• [ ] checked that this code was merged to master

[coveralls]

Pull Request Test Coverage Report for Build 11778151184

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 86 unchanged lines in 16 files lost coverage.
• Overall coverage decreased (-0.02%) to 64.666%

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Files with Coverage Reduction	New Missed Lines	%
ext/json11/json11.cpp	1	64.49%
pdns/recursordist/syncres.cc	1	79.44%
pdns/pollmplexer.cc	1	83.66%
pdns/dnsdistdist/dnsdist-async.cc	2	82.11%
pdns/auth-secondarycommunicator.cc	2	63.78%
pdns/recursordist/test-syncres_cc2.cc	3	88.91%
pdns/misc.hh	3	87.62%
pdns/packethandler.cc	3	72.62%
pdns/backends/gsql/gsqlbackend.hh	3	96.57%
pdns/dnsdistdist/dnsdist.cc	4	68.46%
<!--	Total:	86		-->

Totals
Change from base Build 11777557628:	-0.02%
Covered Lines:	125728
Relevant Lines:	163582

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💛 - Coveralls