Ignore cache export failures #242

Job	Run time
gcc-13 x86_64 system	1m 52s
gcc-13 arm64 system	1m 53s
gcc-12 x86_64 system	1m 55s
gcc-12 arm64 system	1m 49s
gcc-11 x86_64 build	1m 57s
gcc-11 arm64 build	1m 53s
gcc-10 x86_64 build	1m 54s
gcc-10 arm64 build	1m 53s
gcc-9 x86_64 build	1m 52s
gcc-9 arm64 build	1m 52s
gcc-8 x86_64 build	1m 52s
gcc-8 arm64 build	1m 53s
gcc-7 x86_64 build	1m 53s
gcc-7 arm64 build	1m 52s
clang-18 x86_64 system	1m 57s
clang-18 arm64 system	1m 53s
clang-17 x86_64 system	1m 53s
clang-17 arm64 system	1m 51s
clang-16 x86_64 system	1m 52s
clang-16 arm64 system	1m 51s
clang-15 x86_64 build	1m 55s
clang-15 arm64 build	1m 53s
clang-14 x86_64 build	1m 56s
clang-14 arm64 build	1m 54s
clang-13 x86_64 build	1m 55s
clang-13 arm64 build	1m 56s
clang-12 x86_64 build	1m 57s
clang-12 arm64 build	1m 57s
clang-11 x86_64 build	1m 55s
clang-11 arm64 build	1m 54s
clang-10 x86_64 build	1m 58s
clang-10 arm64 build	1m 56s
clang-9 x86_64 build	1m 55s
clang-9 arm64 build	1m 55s
clang-8 x86_64 build	1m 55s
clang-8 arm64 build	2m 0s
clang-7 x86_64 build	1m 57s
clang-7 arm64 build	1m 53s
clang-6.0 x86_64 build	1m 57s
clang-6.0 arm64 build	1m 54s
mingw-w64 x86_64 build	1m 56s
mingw-w64 arm64 build	1m 52s
crossbuild-essential-arm64 x86_64 build	1m 56s
crossbuild-essential-arm64 arm64 build	1m 54s
crossbuild-essential-ppc64el x86_64 build	1m 56s
crossbuild-essential-ppc64el arm64 build	1m 53s
crossbuild-essential-s390x x86_64 build	1m 56s
crossbuild-essential-s390x arm64 build	1m 51s
	1h 31m 23s

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