diff --git a/Dockerfile b/Dockerfile
index 69a62d9..d42f578 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,10 @@
 FROM python:3.11.6-alpine
 ARG KUBECONFIG_CONTENT
+ENV KUBECONFIG_CONTENT ${KUBECONFIG_CONTENT}
 USER root
 RUN adduser -D kfkuser
 RUN pip install strimzi-kafka-cli==0.1.0a76
 USER kfkuser
 RUN mkdir /home/kfkuser/.kube
-RUN echo "${KUBECONFIG_CONTENT}" > /home/kfkuser/.kube/config
+RUN echo "$KUBECONFIG_CONTENT" > /home/kfkuser/.kube/config
 RUN kfk --version
diff --git a/tests/files/yaml/kubeconfig b/tests/files/yaml/kubeconfig
new file mode 100644
index 0000000..a6f4dd0
--- /dev/null
+++ b/tests/files/yaml/kubeconfig
@@ -0,0 +1,19 @@
+apiVersion: v1
+clusters:
+- cluster:
+    certificate-authority-data: testauthdata
+    server: localhost:6443
+  name: DEV
+contexts:
+- context:
+    cluster: DEV
+    user: testuser
+  name: testcontext
+current-context: testcontext
+kind: Config
+preferences: {}
+users:
+- name: testuser
+  user:
+    client-certificate-data: testcertdata
+    client-key-data: testkeydata