Dockerfile

FROM ubuntu:jammy

# Install kubectl
RUN apt-get update && apt-get install -y curl \
    && curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.24.0/bin/linux/amd64/kubectl \
    && mv ./kubectl /usr/local/bin/kubectl \
    && chmod +x /usr/local/bin/kubectl

# Install helm
RUN curl -LO https://get.helm.sh/helm-v3.5.0-linux-amd64.tar.gz \
    && tar -zxvf helm-v3.5.0-linux-amd64.tar.gz \
    && mv linux-amd64/helm /usr/local/bin/helm \
    && chmod +x /usr/local/bin/helm

# Install kustomize
RUN curl -s "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh"  | bash \
    && mv kustomize /usr/local/bin/kustomize \
    && chmod +x /usr/local/bin/kustomize

# Install gettext-base (envsubst)
RUN apt-get update && apt-get install -y gettext-base \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*