Run virtmanager with its new UID

Bug: 183583115
Test: start virtmanager
ps -AZ | grep virtmanager
u: r:virtmanager:s0             virtmanager   2453     1 10930880  4544 0                   0 S virtmanager

Change-Id: Ib98029e61ee094842859609271e4d26b30cd2a7b

apex/Android.bp

@@ -35,6 +35,8 @@ apex {
         "vm",
     ],
     filesystems: ["microdroid"],
+    prebuilts: ["com.android.virt.init.rc"],
+    file_contexts: ":com.android.virt-file_contexts",
 }
 
 apex_key {
@@ -47,3 +49,9 @@ android_app_certificate {
     name: "com.android.virt.certificate",
     certificate: "com.android.virt",
 }
+
+prebuilt_etc {
+    name: "com.android.virt.init.rc",
+    src: "virtmanager.rc",
+    filename: "init.rc",
+}

apex/virtmanager.rc

@@ -0,0 +1,19 @@
+# Copyright (C) 2021 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+service virtmanager /apex/com.android.virt/bin/virtmanager
+    class main
+    user virtmanager
+    group virtmanager
+    disabled