Added kubernetes tooling to image

Signed-off-by: Marcus Noble <github@marcusnoble.co.uk>

Dockerfile

@@ -7,9 +7,11 @@ ARG TARGETARCH=amd64
 
 # ─── Common CLI tools ───────────────────────────────────────────
 RUN apt-get update && apt-get install -y --no-install-recommends \
+        bash \
         ca-certificates \
         curl \
         gcc \
+        gettext \
         git \
         jq \
         less \
@@ -22,6 +24,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         unzip \
         wget \
         xz-utils \
+        yq \
     && rm -rf /var/lib/apt/lists/*
 
 # ─── Python 3 ---────────────────────────────────────────────────
@@ -72,10 +75,33 @@ RUN case "$TARGETARCH" in \
     chmod +x /usr/local/bin/docker && \
     rm -rf docker /tmp/docker.tgz
 
+# ─── kubectl ──────────────────────────────────────────────────
+ARG HELM_VERSION=3.2.1
+ARG KUBECTL_VERSION=1.17.5
+ARG KUSTOMIZE_VERSION=v3.8.1
+ARG KREW_VERSION=v0.4.4
+
+ARG ARCH=amd64
+
+RUN curl -sL https://get.helm.sh/helm-v${HELM_VERSION}-linux-${ARCH}.tar.gz | tar -xvz && \
+    mv linux-${ARCH}/helm /usr/bin/helm && \
+    chmod +x /usr/bin/helm && \
+    rm -rf linux-${ARCH}
+
+RUN curl -sLO "https://dl.k8s.io/release/v${KUBECTL_VERSION}/bin/linux/${ARCH}/kubectl" && \
+    mv kubectl /usr/bin/kubectl && \
+    chmod +x /usr/bin/kubectl
+
+RUN curl -sLO https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2F${KUSTOMIZE_VERSION}/kustomize_${KUSTOMIZE_VERSION}_linux_${ARCH}.tar.gz && \
+    tar xvzf kustomize_${KUSTOMIZE_VERSION}_linux_${ARCH}.tar.gz && \
+    mv kustomize /usr/bin/kustomize && \
+    chmod +x /usr/bin/kustomize && \
+    rm kustomize_${KUSTOMIZE_VERSION}_linux_${ARCH}.tar.gz
+
 # ─── Cleanup ────────────────────────────────────────────────────
 RUN rm -rf /var/lib/apt/lists/* \
     /tmp/* \
     /var/tmp/*
 
 # ─── Persist Go on PATH after /etc/profile resets it ────────────
-RUN printf 'export PATH="/usr/local/go/bin:/usr/local/bin:$PATH"\n' > /etc/profile.d/go.sh
+RUN printf 'export PATH="/usr/local/go/bin:/usr/local/bin:/root/.krew/bin:$PATH"\n' > /etc/profile.d/go.sh