added workflow for handling answerable discussions #177

Job	Run time
linux-compiler-compat (clang-3)	1m 27s
linux-compiler-compat (clang-6)	1m 58s
linux-compiler-compat (clang-8)	2m 5s
linux-compiler-compat (clang-9)	1m 58s
linux-compiler-compat (clang-10)	1m 51s
linux-compiler-compat (clang-11)	1m 43s
linux-compiler-compat (gcc-4.8)	1m 16s
linux-compiler-compat (gcc-5)	1m 25s
linux-compiler-compat (gcc-6)	1m 29s
linux-compiler-compat (gcc-7)	1m 12s
linux-compiler-compat (gcc-8)	1m 22s
linux-shared-libs	1m 23s
clang-sanitizers (,thread)	1m 57s
clang-sanitizers (,address,undefined)	1m 35s
linux-compat (manylinux1-x64)	55s
linux-compat (manylinux1-x86)	1m 8s
linux-compat (manylinux2014-x64)	1m 15s
linux-compat (manylinux2014-x86)	1m 10s
linux-compat (fedora-34-x64)	1m 0s
linux-compat (opensuse-leap)	1m 1s
linux-compat (rhel8-x64)	59s
linux-compat (al2-x64)	53s
osx	1m 33s
windows	2m 54s
windows-app-verifier	4m 40s
windows-shared-libs	5m 54s
windows-vc14 (x86)	2m 3s
windows-vc14 (x64)	1m 57s
downstream	16m 57s
	1h 7m 0s

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