improve docker handling

docker-entrypoint.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+# cspell:words mkdir
+# cspell:enableCompoundWords
+###########################################################
+
+# use environment variables
+if [ "$BASE_URL" != "ROOT" ]; then
+    mkdir -p "$(dirname "$WEBAPP_PATH/$BASE_URL")"
+    mv "$WEBAPP_PATH/ROOT.war" "$WEBAPP_PATH/$BASE_URL.war"
+fi
+
+# base image entrypoint
+if [ -x /docker-entrypoint.sh ]; then
+    /docker-entrypoint.sh "$@"
+else
+    exec "$@"
+fi