Add arch to AMI name filter

Author: moskyb

packer/linux/buildkite-ami.json

@@ -12,7 +12,7 @@
       "region": "{{user `region`}}",
       "source_ami_filter": {
         "filters": {
-          "name": "amzn2-ami-hvm-2.0.20220207.1-gp2",
+          "name": "amzn2-ami-hvm-2.0.20220207.1-{{user `arch`}}-gp2",
           "architecture": "{{user `arch`}}",
           "virtualization-type": "hvm"
         },