ci: use org variable for AWS EC2 AMI in E2E CI jobs

Signed-off-by: Nathan Weinberg <nweinber@redhat.com>

Author: nathan-weinberg

.github/workflows/e2e-nvidia-a10g-x1.yml

@@ -54,7 +54,7 @@ jobs:
         with:
           mode: start
           github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
-          ec2-image-id: ami-01a89eee1adde309c
+          ec2-image-id: ${{ vars.AWS_EC2_AMI }}
           ec2-instance-type: g5.4xlarge
           subnet-id: subnet-02d230cffd9385bd4
           security-group-id: sg-06300447c4a5fbef3

.github/workflows/e2e-nvidia-l40s-x4.yml

@@ -32,7 +32,7 @@ jobs:
         with:
           mode: start
           github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
-          ec2-image-id: ami-01a89eee1adde309c
+          ec2-image-id: ${{ vars.AWS_EC2_AMI }}
           ec2-instance-type: g6e.12xlarge
           subnet-id: subnet-024298cefa3bedd61
           security-group-id: sg-06300447c4a5fbef3