add option to change cache behavior (CACHE_GREEDY_MODE) #126
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In default mode a layer exist only once in the cache, and regardless
which repository it is initially from, each repository get a hit on
this layer now.
Pitfall: You can not push images that reuse layers from a different
registry (
ALLOW_PUSH=true
).Setting this option to 'false' adds the host to the cache key to solve this.
Default is
true
to not change default behavior.WARNING: Changing this setting invalidates your cache!