cache php extensions #2378

Job	Run time
php (7.4, false)	1m 15s
php (7.4, false)	1m 4s
php (8.0, false)	1m 11s
php (8.0, false)	1m 11s
php (8.1, false)	1m 3s
php (8.1, false)	1m 11s
php (8.2, false)	1m 10s
php (8.2, false)	1m 11s
php (8.3, false)	1m 20s
php (8.3, false)	1m 17s
php (8.4, true, --ignore-platform-reqs)	19m 38s
php (8.4, true, --ignore-platform-reqs)	19m 30s
packages / validate (7.4, ubuntu-latest, ast, json, grpc, false)	49s
packages / validate (7.4, ubuntu-latest, ast, json, grpc, false)	51s
packages / validate (8.0, ubuntu-latest, ast, json, grpc, false)	58s
packages / validate (8.0, ubuntu-latest, ast, json, grpc, false)	1m 8s
packages / validate (8.1, ubuntu-latest, ast, json, grpc, false)	1m 10s
packages / validate (8.1, ubuntu-latest, ast, json, grpc, false)	50s
packages / validate (8.2, ubuntu-latest, ast, json, grpc, false)	1m 7s
packages / validate (8.2, ubuntu-latest, ast, json, grpc, false)	1m 11s
packages / validate (8.3, ubuntu-latest, ast, json, grpc, false)	56s
packages / validate (8.3, ubuntu-latest, ast, json, grpc, false)	54s
	1h 0m 55s

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