Add us-east-1 hosts file and update regions (#4042)

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## Issue ticket number and link

## Checklist before requesting a review

- [x] 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? if so did you add the relevant
metrics to the dashboard?
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.github/workflows/deploy-prod.yml

@@ -49,7 +49,7 @@ jobs:
         shell: bash
     strategy:
       matrix:
-        target_region: [ us-east-2, us-west-2, eu-central-1, ap-southeast-1 ]
+        target_region: [ us-east-2, us-west-2, eu-central-1, ap-southeast-1, us-east-1 ]
     environment:
       name: prod-${{ matrix.target_region }}
     steps:
@@ -97,6 +97,10 @@ jobs:
             target_cluster: prod-ap-southeast-1-epsilon
             deploy_link_proxy: false
             deploy_legacy_scram_proxy: false
+          - target_region: us-east-1
+            target_cluster: prod-us-east-1-theta
+            deploy_link_proxy: false
+            deploy_legacy_scram_proxy: false
     environment:
       name: prod-${{ matrix.target_region }}
     steps: