Fix frequent disconnections - Ensure keepalive is set

[Steve-Mcl]

Description

Ensure keepalive is set to a value sub 60s to avoid AWS ALB timeout of 60s

I have tested various values locally, connecting up to staging. 45s provides a very stable env (1h seen 0 drops, previously I would see ~50 drops per hour when averaged over 8h monitoring)

Related Issue(s)

14

Checklist

• [x] I have read the contribution guidelines
• [ ] Suitable unit/system level tests have been added and they pass
• [ ] Documentation has been updated
  • [ ] Upgrade instructions
  • [ ] Configuration details
  • [ ] Concepts
• [ ] Changes flowforge.yml?
  • [ ] Issue/PR raised on flowforge/helm to update ConfigMap Template
  • [ ] Issue/PR raised on flowforge/CloudProject to update values for Staging/Production

Labels

• [ ] Backport needed? -> add the backport label
• [ ] Includes a DB migration? -> add the area:migration label