Filter out skip_worktree statuses #54

Job	Run time
Create container: xenial	26s
Create container: bionic	18s
Create container: focal	24s
Create container: docurium	29s
Create container: bionic-x86	19s
Create container: bionic-arm32	20s
Create container: bionic-arm64	19s
Create container: centos7	25s
Create container: centos8	29s
Generate documentation	25s
Build: Linux (Xenial, GCC, OpenSSL)	24s
Build: Linux (Xenial, GCC, mbedTLS)	28s
Build: Linux (Xenial, Clang, OpenSSL)	27s
Build: Linux (Xenial, Clang, mbedTLS)	29s
Build: macOS	25m 29s
Build: Windows (amd64, Visual Studio)	1m 32s
Build: Windows (x86, Visual Studio)	2m 24s
Build: Windows (amd64, mingw)	55s
Build: Windows (x86, mingw)	1m 3s
Build: Sanitizer (Memory)	33s
Build: Sanitizer (UndefinedBehavior)	29s
Build: Sanitizer (Thread)	30s
Build: Linux (SHA256, Xenial, Clang, OpenSSL)	30s
Build: macOS (SHA256)	25m 17s
Build: Windows (SHA256, amd64, Visual Studio)	2m 6s
Test results	5s
	1h 6m 35s

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