test: aws fallback region

Author: soonum

ci/slab.toml

@@ -1,9 +1,15 @@
 [profile.cpu]
 region = "eu-west-3"
 image_id = "ami-05e8e219ac7e82eba" # ubuntu 22.04
-instance_type = "t3.micro"
+#instance_type = "t3.micro"
+instance_type = "m6g.large"
 subnet_id = "subnet-0e042c7621461f754"
 
+[profile.cpu_fallback]
+region = "us-east-1"
+image_id = "ami-0715c1897453cabd1"
+instance_type = "t3.micro"
+
 [profile.gpu]
 region = "eu-west-1"  # Ireland
 image_id = "ami-0261faf04cf54fe0a"  # GPU image in eu-west-1 to test auto retry