Add the known limitation that the FDB cluster is only reachable from within Kubernetes

[johscheuer]

Description

Fixes: #789

Type of change

Please select one of the options below.

• Documentation

Discussion

Testing

N/A

Documentation

Added.

Follow-up

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux CentOS 7

• Commit ID: 0ae74db
• Duration 2:01:24
• Result: ❌ FAILED
• Error: Error while executing command: if $fail_test; then exit 1; fi. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux CentOS 7

• Commit ID: 654ff42
• Duration 2:05:46
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)