Enable configuring a common parent folder under which all attachments stored.
This enables sharing same bucket with multiple clusters
## Description
Currently the attachments are stored with path structure
`whiskentity/<namespace>/<docId>/<name>`. With this PR it would be possible to
also specify a parent path under which this path would be created. So path
structure would be like `<prefix>/whiskentity/<namespace>/<docId>/<name>`
### Config
The prefix can be specified via `prefix` setting (optional)
```
whisk {
s3 {
alpakka {
aws {
credentials {
provider = static
access-key-id = "$accessKey"
secret-access-key = "$secretAccessKey"
}
region {
provider = static
default-region = us-west-2
}
}
endpoint-url = "http://localhost:$port";
}
bucket = "openwhisk"
prefix = "dev-cluster"
}
}
```
## Related issue and scope
<!--- Please include a link to a related issue if there is one. -->
- [ ] I opened an issue to propose and discuss this change (#????)
## My changes affect the following components
<!--- Select below all system components are affected by your change. -->
<!--- Enter an `x` in all applicable boxes. -->
- [ ] API
- [ ] Controller
- [ ] Message Bus (e.g., Kafka)
- [ ] Loadbalancer
- [ ] Invoker
- [ ] Intrinsic actions (e.g., sequences, conductors)
- [x] Data stores (e.g., CouchDB)
- [ ] Tests
- [ ] Deployment
- [ ] CLI
- [ ] General tooling
- [ ] Documentation
## Types of changes
<!--- What types of changes does your code introduce? Use `x` in all the boxes
that apply: -->
- [ ] Bug fix (generally a non-breaking change which closes an issue).
- [x] Enhancement or new feature (adds new functionality).
- [ ] Breaking change (a bug fix or enhancement which changes existing
behavior).
## Checklist:
<!--- Please review the points below which help you make sure you've covered
all aspects of the change you're making. -->
- [x] I signed an [Apache
CLA](https://github.com/apache/incubator-openwhisk/blob/master/CONTRIBUTING.md).
- [x] I reviewed the [style
guides](https://github.com/apache/incubator-openwhisk/wiki/Contributing:-Git-guidelines#code-readiness)
and followed the recommendations (Travis CI will check :).
- [x] I added tests to cover my changes.
- [ ] My changes require further changes to the documentation.
- [ ] I updated the documentation where necessary.
[ Full content available at:
https://github.com/apache/incubator-openwhisk/pull/3983 ]
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