update charts
diff --git a/charts/k8s-gerrit/container-images/base/Dockerfile b/charts/k8s-gerrit/container-images/base/Dockerfile
new file mode 100644
index 0000000..120a1a0
--- /dev/null
+++ b/charts/k8s-gerrit/container-images/base/Dockerfile
@@ -0,0 +1,11 @@
+ARG BASE_IMAGE=alpine:3.18.2
+FROM $BASE_IMAGE
+
+ENV LC_ALL=C.UTF-8
+ENV LANG=C.UTF-8
+
+RUN apk update && \
+ apk add --no-cache git
+
+ARG GERRIT_UID=1000
+RUN adduser -D gerrit -u $GERRIT_UID -G users
diff --git a/charts/k8s-gerrit/container-images/base/README.md b/charts/k8s-gerrit/container-images/base/README.md
new file mode 100644
index 0000000..59533cb
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+++ b/charts/k8s-gerrit/container-images/base/README.md
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+# Base image
+
+This is the base Docker image for Gerrit deployment on Kubernetes.
+It is only used in the build process and not published on Dockerhub.
+
+## Content
+
+* Alpine Linux 3.10.0
+* git
+* create `gerrit`-user as a non-root user to run the applications