Linux

CI: try caching rustls build in ~/root/rustls #737

Job	Run time
Empty APLOGNO() test	23s
Default	3m 18s
All-static modules	3m 25s
Prefork MPM, all-modules (except cgid)	4m 51s
Worker MPM, all-modules	4m 21s
Shared MPMs, all-modules	4m 4s
Event MPM, all-modules, mod_cgid only	3m 54s
Event MPM, all-modules, no CMSG_DATA	4m 0s
Default, all-modules + install	4m 17s
Default, all-modules, random test order	4m 3s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 12s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 46s
APR 1.8.x, APR-util 1.7.x	5m 30s
Pool-debug	6m 25s
Shared MPMs (event), pool-debug, SSL/TLS variants	8m 55s
Shared MPMs (worker), pool-debug, SSL/TLS variants	8m 18s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	8m 38s
litmus WebDAV tests	2m 0s
litmus WebDAV tests, APR trunk, LMDB	1m 59s
Regenerate ap_expr	4m 21s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 39s
APR trunk thread debugging	4m 47s
UBSan	4m 36s
ASan	6m 25s
ASan, pool-debug	7m 18s
HTTP/2 test suite	11m 42s
MOD_TLS test suite	5m 11s
Configured w/reduced exports	1m 53s
	2h 19m 11s

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