Fix cidata user-data ca_certs yaml content

This is failing the cloud-config jsonschema validation, later.
  $ sudo cloud-init schema --system
  Error: Cloud config schema errors:
    ca_certs.trusted: None is not of type 'array'

Signed-off-by: Anders F Björklund <[email protected]>

Author: afbjorklund

pkg/cidata/cidata.TEMPLATE.d/user-data

@@ -66,13 +66,15 @@ resolv_conf:
 {{ with .CACerts }}
 ca_certs:
   remove_defaults: {{ .RemoveDefaults }}
+  {{- if .Trusted}}
   trusted:
   {{- range $cert := .Trusted }}
   - |
     {{- range $line := $cert.Lines }}
     {{ $line }}
     {{- end }}
   {{- end }}
+  {{- end }}
 {{- end }}
 
 {{- if .BootCmds }}

pkg/cidata/template_test.go

@@ -22,6 +22,9 @@ func TestTemplate(t *testing.T) {
 			{MountPoint: "/Users/dummy/lima"},
 		},
 		MountType: "reverse-sshfs",
+		CACerts: CACerts{
+			Trusted: []Cert{},
+		},
 	}
 	layout, err := ExecuteTemplate(args)
 	assert.NilError(t, err)
@@ -33,6 +36,8 @@ func TestTemplate(t *testing.T) {
 		if f.Path == "user-data" {
 			// mounted later
 			assert.Assert(t, !strings.Contains(string(b), "mounts:"))
+			// ca_certs:
+			assert.Assert(t, !strings.Contains(string(b), "trusted:"))
 		}
 	}
 }