Filter out skip_worktree statuses #53

Job	Run time
Create container: xenial	1s
Create container: bionic	1s
Create container: focal	2s
Create container: docurium	1s
Create container: bionic-x86	4s
Create container: bionic-arm32	3s
Create container: bionic-arm64	2s
Create container: centos7	3s
Create container: centos8	1s
Generate documentation	39s
Build: Linux (Xenial, GCC, OpenSSL)	29s
Build: Linux (Xenial, GCC, mbedTLS)	28s
Build: Linux (Xenial, Clang, OpenSSL)	24s
Build: Linux (Xenial, Clang, mbedTLS)	26s
Build: macOS	29m 3s
Build: Windows (amd64, Visual Studio)	2m 17s
Build: Windows (x86, Visual Studio)	2m 2s
Build: Windows (amd64, mingw)	50s
Build: Windows (x86, mingw)	1m 0s
Build: Sanitizer (Memory)	38s
Build: Sanitizer (UndefinedBehavior)	32s
Build: Sanitizer (Thread)	39s
Build: Linux (SHA256, Xenial, Clang, OpenSSL)	36s
Build: macOS (SHA256)	26m 31s
Build: Windows (SHA256, amd64, Visual Studio)	1m 31s
Test results	2s
	1h 8m 25s

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