Run linux build in ubuntu:20.04 container #76
Merged
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The Linux build commands will now run inside an ubuntu:20.04 container inside the ubuntu-latest GitHub Actions VM. The resulting libdoorstop.so's now have much relaxed GLIBC requirements of only 2.7 just like the UnityDoorstop.Unix version. There is an additional linking to libdl.so.2 but I don't believe that will cause any issues.
Fixes #75