Test

Add ZipArchive::closeToString() #854

Job	Run time
Generate Matrix	11s
Suite / LINUX_X32_DEBUG_ZTS	11m 38s
Suite / LINUX_X64_ASAN_DEBUG_ZTS	11m 53s
Suite / ALPINE_X64_ASAN_DEBUG_ZTS	2m 22s
Suite / FREEBSD_NTS	4m 20s
Suite / LINUX_X64_RELEASE_NTS	11m 51s
Suite / MACOS_ARM64_DEBUG_NTS	1s
Suite / WINDOWS_X64_ZTS	11m 43s
Suite / BENCHMARKING	11m 50s
Suite / SOLARIS	0s
Suite / MSAN	0s
Suite / LIBMYSQLCLIENT	0s
Suite / LINUX_PPC64_ASAN_DEBUG_ZTS	0s
Suite / COVERAGE	0s
Suite / OPCACHE_VARIATION	0s
Suite / COMMUNITY_${{ matrix.type }}	0s
Suite / PECL	0s
	1h 5m 49s

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