fix the entrypoint error

Author: wahyd4

Dockerfile

@@ -2,4 +2,4 @@ FROM dtzar/helm-kubectl:3.2.0
 
 COPY run.sh .
 
-ENTRYPOINT [ "/run.sh" ]
+ENTRYPOINT [ "sh", "-c","./run.sh" ]

run.sh

@@ -1,5 +1,7 @@
 #!/bin/sh -eu
 
+: "${KUBE_CONFIG_DATA?Must be specified}"
+
 # Extract the base64 encoded config data and write this to the KUBECONFIG
 echo "$KUBE_CONFIG_DATA" | base64 --decode > /tmp/config