Allow overriding number of executors
diff --git a/Dockerfile b/Dockerfile
index f40bc67..eb1b68e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,7 +23,7 @@
# `/usr/share/jenkins/ref/` contains all reference configuration we want
# to set on a fresh new installation. Use it to bundle additional plugins
# or config file with your custom jenkins Docker image.
-RUN mkdir -p /usr/share/jenkins/ref/init.groovy.d
+RUN mkdir -p /usr/share/jenkins/ref/init.groovy.d; chown ${uid}:${gid} /usr/share/jenkins/ref/init.groovy.d
ENV TINI_VERSION 0.9.0
ENV TINI_SHA fa23d1e20732501c3bb8eeeca423c89ac80ed452