Linux

CI: Enable caching for the rustls install used for mod_tls testing. #740

Job	Run time
Empty APLOGNO() test	1m 22s
Default	3m 35s
All-static modules	3m 45s
Prefork MPM, all-modules (except cgid)	4m 2s
Worker MPM, all-modules	3m 50s
Shared MPMs, all-modules	3m 57s
Event MPM, all-modules, mod_cgid only	4m 11s
Event MPM, all-modules, no CMSG_DATA	3m 46s
Default, all-modules + install	4m 10s
Default, all-modules, random test order	4m 50s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 6s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 33s
APR 1.8.x, APR-util 1.7.x	5m 29s
Pool-debug	5m 55s
Shared MPMs (event), pool-debug, SSL/TLS variants	8m 48s
Shared MPMs (worker), pool-debug, SSL/TLS variants	9m 25s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 3s
litmus WebDAV tests	2m 31s
litmus WebDAV tests, APR trunk, LMDB	2m 26s
Regenerate ap_expr	3m 54s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 29s
APR trunk thread debugging	4m 7s
UBSan	5m 12s
ASan	6m 6s
ASan, pool-debug	6m 38s
HTTP/2 test suite	12m 4s
MOD_TLS test suite	5m 4s
Configured w/reduced exports	2m 15s
	2h 20m 33s

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