remove bash, make temp file

entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 # INPUT_FILE="$1"
@@ -93,9 +93,11 @@ echo "Generating Kubernetes YAML from .kforge.yml"
 # ----------------------------------------------------------------
 # Build kubeconfig from token-based credentials
 echo "Configuring kubectl..."
+echo "$INPUT_KUBE_CERTIFICATE" | base64 -d > /tmp/kube-ca.crt
+
 kubectl config set-cluster default \
 --server="$INPUT_KUBE_HOST" \
---certificate-authority=<(echo "$INPUT_KUBE_CERTIFICATE" | base64 -d)
+--certificate-authority=/tmp/kube-ca.crt
 
 kubectl config set-credentials default \
 --token="$INPUT_KUBE_TOKEN"
@@ -106,6 +108,8 @@ kubectl config set-context default \
 
 kubectl config use-context default
 
+rm -f /tmp/kube-ca.crt
+
 # Create/update regcred secret idempotently
 echo "Creating regcred secret..."
 kubectl create secret docker-registry regcred \