test: multi-region tests

Author: dreamorosi

Diff for: .github/workflows/run-e2e-tests.yml

@@ -21,7 +21,7 @@ jobs:
       id-token: write # needed to interact with GitHub's OIDC Token endpoint.
       contents: read
     strategy:
-      max-parallel: 30
+      # max-parallel: 30
       matrix:
         package:
           [
@@ -62,11 +62,18 @@ jobs:
         uses: aws-powertools/actions/.github/actions/cached-node-modules@29979bc5339bf54f76a11ac36ff67701986bb0f0
         with:
           nodeVersion: '22'
+      - name: Round robin region
+        id: round-robin-region
+        run: |
+          regions_available=(eu-west-1 us-east-1)
+          region=${regions_available[$((RANDOM % ${#regions[@]}))]}
+          # Set the region as an output variable
+          echo "region=$region" >> $GITHUB_OUTPUT
       - name: Setup AWS credentials
         uses: aws-actions/configure-aws-credentials@ececac1a45f3b08a01d2dd070d28d111c5fe6722 # v4.1.0
         with:
           role-to-assume: ${{ secrets.AWS_ROLE_ARN_TO_ASSUME }}
-          aws-region: eu-west-1
+          aws-region: ${{ steps.round-robin-region.outputs.region }}
           mask-aws-account-id: true
       - name: Run integration tests on utils
         env: