Allow passing extra java opts and proxy env

Change-Id: I4b0350c24ff461a9c08c71ee587dd08570ce2929
diff --git a/docker/init.yml b/docker/init.yml
new file mode 100644
index 0000000..8ef5e2c
--- /dev/null
+++ b/docker/init.yml
@@ -0,0 +1,6 @@
+parameters:
+  _param:
+    http_proxy: ""
+    docker_http_proxy: ${_param:http_proxy}
+    docker_https_proxy: ${_param:docker_http_proxy}
+    docker_no_proxy: ""