Use smaller Vetu image for Linux tests

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
           sudo setcap cap_net_raw,cap_net_admin+eip "$RUNNER_TEMP/vetu"
           echo "$RUNNER_TEMP" >> "$GITHUB_PATH"
       - name: Pre-pull default Vetu image
-        run: vetu pull ghcr.io/cirruslabs/ubuntu-runner-amd64:latest
+        run: vetu pull ghcr.io/cirruslabs/ubuntu:latest
       - name: Run tests
         run: go test -v -count=1 ./...
 

internal/imageconstant/imageconstant.go

@@ -2,5 +2,5 @@ package imageconstant
 
 const (
 	DefaultMacosImage = "ghcr.io/cirruslabs/macos-tahoe-base:latest"
-	DefaultLinuxImage = "ghcr.io/cirruslabs/ubuntu-runner-amd64:latest"
+	DefaultLinuxImage = "ghcr.io/cirruslabs/ubuntu:latest"
 )