Update tools/Dockerfile

Co-authored-by: Nick <10092581+NickLarsenNZ@users.noreply.github.com>

Author: lfrancke

tools/Dockerfile

@@ -36,7 +36,7 @@ ENV PATH=/stackable/bin:$PATH
 
 # Get latest stable version from curl -L -s https://dl.k8s.io/release/stable.txt
 RUN <<EOF
-curl https://dl.k8s.io/release/v${KUBECTL_VERSION}/bin/linux/${TARGETARCH}/kubectl \
+curl "https://dl.k8s.io/release/v${KUBECTL_VERSION}/bin/linux/${TARGETARCH}/kubectl" \
     -o /stackable/bin/kubectl
 chmod +x /stackable/bin/kubectl