Linux

CI: try caching rustls build in ~/root/rustls #739

Job	Run time
Empty APLOGNO() test	24s
Default	3m 36s
All-static modules	3m 35s
Prefork MPM, all-modules (except cgid)	4m 40s
Worker MPM, all-modules	3m 59s
Shared MPMs, all-modules	3m 53s
Event MPM, all-modules, mod_cgid only	3m 46s
Event MPM, all-modules, no CMSG_DATA	4m 21s
Default, all-modules + install	4m 5s
Default, all-modules, random test order	3m 49s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 2s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 48s
APR 1.8.x, APR-util 1.7.x	5m 52s
Pool-debug	6m 0s
Shared MPMs (event), pool-debug, SSL/TLS variants	8m 37s
Shared MPMs (worker), pool-debug, SSL/TLS variants	8m 19s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 13s
litmus WebDAV tests	2m 4s
litmus WebDAV tests, APR trunk, LMDB	2m 51s
Regenerate ap_expr	3m 58s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 40s
APR trunk thread debugging	3m 50s
UBSan	4m 56s
ASan	6m 30s
ASan, pool-debug	6m 48s
HTTP/2 test suite	12m 14s
MOD_TLS test suite	4m 57s
Configured w/reduced exports	1m 57s
	2h 18m 44s

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