Filter out skip_worktree statuses #52

Job	Run time
Create container: xenial	1s
Create container: bionic	1s
Create container: focal	3s
Create container: docurium	2s
Create container: bionic-x86	9s
Create container: bionic-arm32	4s
Create container: bionic-arm64	4s
Create container: centos7	2s
Create container: centos8	1s
Generate documentation	27s
Build: Linux (Xenial, GCC, OpenSSL)	25s
Build: Linux (Xenial, GCC, mbedTLS)	24s
Build: Linux (Xenial, Clang, OpenSSL)	25s
Build: Linux (Xenial, Clang, mbedTLS)	27s
Build: macOS	25m 6s
Build: Windows (amd64, Visual Studio)	1m 55s
Build: Windows (x86, Visual Studio)	1m 33s
Build: Windows (amd64, mingw)	51s
Build: Windows (x86, mingw)	1m 6s
Build: Sanitizer (Memory)	31s
Build: Sanitizer (UndefinedBehavior)	27s
Build: Sanitizer (Thread)	29s
Build: Linux (SHA256, Xenial, Clang, OpenSSL)	26s
Build: macOS (SHA256)	26m 22s
Build: Windows (SHA256, amd64, Visual Studio)	1m 49s
Test results	3s
	1h 3m 13s

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