omni: aconfig: Add empty release_config_map for textproto variant to be picked up

Change-Id: I898c58e98ca3b9d2417644e576ba087098ad201b
diff --git a/release/release_config_map.mk b/release/release_config_map.mk
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/release/release_config_map.mk
diff --git a/release/release_config_map.textproto b/release/release_config_map.textproto
index 81ec299..e3b00e7 100644
--- a/release/release_config_map.textproto
+++ b/release/release_config_map.textproto
@@ -1,3 +1,8 @@
+default_containers: "product"
+default_containers: "system"
+default_containers: "system_ext"
+default_containers: "vendor"
+
 release_config {
     name: "ap3a"
     flag_value_files: "build_config/ap3a.textproto"