fix: configure proper creds for cleanup (#2093)

Author: samrose

.github/workflows/ami-release-nix.yml

@@ -255,6 +255,13 @@ jobs:
           SLACK_MESSAGE: 'Building Postgres AMI failed'
           SLACK_FOOTER: ''
 
+      - name: configure aws credentials for cleanup
+        if: ${{ always() }}
+        uses: aws-actions/configure-aws-credentials@7474bc4690e29a8392af63c5b98e7449536d5c3a # v4.3.1
+        with:
+          role-to-assume: ${{ secrets.DEV_AWS_ROLE }}
+          aws-region: "us-east-1"
+
       - name: Cleanup resources after build
         if: ${{ always() }}
         run: |