Add Support for "Write-Only" Cache Mode in @nx/s3-cache

[skrtheboss]

Description:

We would like to request that the @nx/s3-cache package add support for a "write-only" cache mode. Currently, we are unable to set the cache to "write-only," which is needed for builds on the master or release branches to avoid cache poisoning while still pushing the cache.

Use Case:

For builds on the master or release branches, we want to ensure that no cache is read (to prevent poisoning) but still want to push the cache. Adding a "write-only" mode would help us achieve this.

Request:

Please add a cache mode option for "write-only" to the @nx/s3-cache package. This would allow us to safely push cache without reading from it during builds on specific branches like master or release.