Install kubectl

Dockerfile

@@ -5,15 +5,26 @@ ENV DEBIAN_FRONTEND=noninteractive
 RUN \
     apt-get update && \
     apt-get --no-install-recommends --yes install \
+        apt-transport-https \
         ca-certificates \
+        curl \
+        && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/deb/Release.key | gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg \
+    echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.28/deb/ /' | tee /etc/apt/sources.list.d/kubernetes.list
+
+RUN \
+    apt-get update && \
+    apt-get --no-install-recommends --yes install \
         vim emacs-nox nano \
         jq \
         tar gzip bzip2 zip unzip p7zip \
         openssh-client \
         openssl \
         gnupg \
         git \
-        curl \
         wget \
         iputils-arping \
         iputils-clockdiff \
@@ -34,6 +45,7 @@ RUN \
         ldap-utils \
         postgresql-client \
         nettle-bin \
+        kubectl \
         && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*