Add cache restore lookupOnly option
#1286
Merged
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This PR adds a
lookupOnlyoption to the cache restore function.It can be used to check if a cache exists without the need to download it.
Especially useful if e.g. dependency install and actual tests are split across multiple jobs. If the cache restore step for the dependency install has an exact hit, the remaining steps in the job can be skipped. Similarly if the cache is created from scratch and it's just necessary to know if a cache entry already exists.
Would help address
actions/cache#901
actions/cache#831
actions/cache#1020 (comment)
actions/cache#1020 (comment)
Alternative to #1207
CC: @kotewar