Filter out skip_worktree statuses #48

Job	Run time
Create container: xenial	1s
Create container: bionic	2s
Create container: focal	2s
Create container: docurium	3s
Create container: bionic-x86	2s
Create container: bionic-arm32	5s
Create container: bionic-arm64	4s
Create container: centos7	2s
Create container: centos8	2s
Generate documentation	24s
Build: Linux (Xenial, GCC, OpenSSL)	26s
Build: Linux (Xenial, GCC, mbedTLS)	23s
Build: Linux (Xenial, Clang, OpenSSL)	25s
Build: Linux (Xenial, Clang, mbedTLS)	26s
Build: macOS	26m 17s
Build: Windows (amd64, Visual Studio)	2m 34s
Build: Windows (x86, Visual Studio)	2m 59s
Build: Windows (amd64, mingw)	1m 8s
Build: Windows (x86, mingw)	1m 7s
Build: Sanitizer (Memory)	30s
Build: Sanitizer (UndefinedBehavior)	27s
Build: Sanitizer (Thread)	30s
Build: Linux (SHA256, Xenial, Clang, OpenSSL)	26s
Build: macOS (SHA256)	25m 54s
Build: Windows (SHA256, amd64, Visual Studio)	2m 26s
Test results	5s
	1h 6m 50s

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