Update Dockerfile

Author: akatkov

verdaccio/Dockerfile

@@ -1,5 +1,9 @@
-FROM verdaccio/verdaccio:5.1.1
+FROM verdaccio/verdaccio:5.1.1 as common
+
+FROM common as builder
 USER root
 ENV NODE_ENV=production
-RUN mkdir /verdaccio/plugins && cd /verdaccio/plugins && npm install verdaccio-static-token
-USER verdaccio
+RUN npm install -g verdaccio-static-token
+
+FROM common
+COPY --from=builder --chown=$VERDACCIO_USER_UID:root /opt/verdaccio/node_modules/verdaccio-static-token /verdaccio/plugins/verdaccio-static-token