feat: rolling update one pod at a time, adjust k8s resources

[hasakura12]

Deployed

TEST

Deployed one at a time

pod/reflux-solver-6db4c868d6-cfmk5   1/1
  Running     0          3m29s
pod/reflux-solver-6db4c868d6-xkjk4   1/1
  Running     0          2m49s

pod metrics after deployment

Describe your changes

• rolling update one pod at a time to make sure maxUnavailable=0
• lower CPU & memory requests & limit

Usage at peak in last 30 days:
Reflux-solver:

• Memory: 50m
• CPU: 0.01

Reflux-indexer usage:

• memory: 20m
• CPU: 0.001

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics?
• Will this be part of a product update? If yes, please write one phrase about this update.