chore: move staging mainnet to dev cluster

Author: bernokl

.github/workflows/cardano-services.yaml

@@ -51,7 +51,7 @@ name: cardano-services
         - local-network@us-east-1@v1
         - ops-preprod-1@us-east-1
         - ops-preview-1@us-east-1
-        - staging-mainnet@eu-west-1@v2
+        - staging-mainnet@us-east-1@v2
         - staging-preprod@us-east-1@v2
         required: true
         type: choice

nix/cardano-services/deployments/default.nix

@@ -478,12 +478,12 @@ in
           };
         };
 
-        "staging-mainnet@eu-west-1@v2" = final: {
+        "staging-mainnet@us-east-1@v2" = final: {
           name = "${final.namespace}-cardanojs-v2";
           namespace = "staging-mainnet";
           context = "eks-devs";
           network = "mainnet";
-          region = "eu-west-1";
+          region = "us-east-1";
 
           providers = {
             backend = {