Add explicit 30s timeout to all goss assertions that pull docker images

goss.yaml

@@ -128,32 +128,38 @@ command:
   # Check docker userns is enabled
   docker info --format='{{ `{{range .SecurityOptions}}{{if eq . "name=userns"}}{{"success"}}{{end}}{{end}}` }}':
     exit-status: 0
+    timeout: 30000
     stdout:
     - success
 
   # Check docker plugins are installed
   docker info --format=$'{{ `{{range .ClientInfo.Plugins}}{{if eq .Name "buildx"}}success\n{{end}}{{if eq .Name "compose" }}success{{end}}{{end}}` }}':
     exit-status: 0
+    timeout: 30000
     stdout:
     - success
     - success
 
   # Check that docker containers can run
   docker run --rm -v /var/run/docker.sock:/var/run/docker.sock docker:latest version:
     exit-status: 0
+    timeout: 30000
 
   # Check that userns allows writing as buildkite-agent
   sh -c 'docker run --rm -v "$PWD:/pwd" alpine:latest touch /pwd/test && stat -c %U:%G test' && rm test:
     exit-status: 0
+    timeout: 30000
     stdout:
     - buildkite-agent:docker
 
   docker run --rm -t arm64v8/ubuntu uname -m:
     exit-status: 0
+    timeout: 30000
     stdout:
     - aarch64
 
   docker run --rm -t amd64/ubuntu uname -m:
     exit-status: 0
+    timeout: 30000
     stdout:
     - x86_64