refactor: optimize Dockerfile

Author: masontikhonov

Dockerfile

@@ -1,48 +1,16 @@
-# ⚠️ If updating supported `kubectl` versions,
-# please also update `./cf-deploy-kubernetes.sh` accordingly.
-
-ARG DEBIAN_VERSION=bookworm-20251103-slim
-
-
-FROM debian:${DEBIAN_VERSION} AS builder
+FROM debian:bookworm-20251103-slim AS prod
 ARG TARGETPLATFORM
-RUN apt-get update && apt-get install -y build-essential
-
-ARG BUSYBOX_VERSION=1.36.1
-ADD https://busybox.net/downloads/busybox-${BUSYBOX_VERSION}.tar.bz2 /busybox-${BUSYBOX_VERSION}.tar.bz2
-ADD https://busybox.net/downloads/busybox-${BUSYBOX_VERSION}.tar.bz2.sha256 /busybox-${BUSYBOX_VERSION}.tar.bz2.sha256
-RUN echo "$(cat busybox-${BUSYBOX_VERSION}.tar.bz2.sha256)  busybox-${BUSYBOX_VERSION}.tar.bz2" | sha256sum --check
-RUN tar -xvjf busybox-${BUSYBOX_VERSION}.tar.bz2 \
-    && cd busybox-${BUSYBOX_VERSION} \
-    && make defconfig \
-    && make \
-    && make CONFIG_PREFIX="/" install
-
-ADD https://dl.k8s.io/release/v1.34.1/bin/${TARGETPLATFORM}/kubectl /kubectl/kubectl1.34
-ADD https://dl.k8s.io/release/v1.34.1/bin/${TARGETPLATFORM}/kubectl.sha256 /kubectl1.34.sha256
-RUN echo "$(cat kubectl1.34.sha256)  /kubectl/kubectl1.34" | sha256sum --check
-
-ADD https://dl.k8s.io/release/v1.33.5/bin/${TARGETPLATFORM}/kubectl /kubectl/kubectl1.33
-ADD https://dl.k8s.io/release/v1.33.5/bin/${TARGETPLATFORM}/kubectl.sha256 /kubectl1.33.sha256
-RUN echo "$(cat kubectl1.33.sha256)  /kubectl/kubectl1.33" | sha256sum --check
-
-ADD https://dl.k8s.io/release/v1.32.9/bin/${TARGETPLATFORM}/kubectl /kubectl/kubectl1.32
-ADD https://dl.k8s.io/release/v1.32.9/bin/${TARGETPLATFORM}/kubectl.sha256 /kubectl1.32.sha256
-RUN echo "$(cat kubectl1.32.sha256)  /kubectl/kubectl1.32" | sha256sum --check
-
-
-
-FROM debian:${DEBIAN_VERSION} AS prod
 RUN adduser --gecos "" --disabled-password --home /home/cfu --shell /bin/bash cfu
-
 COPY --chown=cfu --chmod=775 cf-deploy-kubernetes.sh /cf-deploy-kubernetes
 COPY --chown=cfu --chmod=775 template.sh /template.sh
-
-COPY --chown=cfu --chmod=775 --from=builder /usr/bin/busybox /usr/bin/busybox
+COPY --from=busybox:1.36.1-musl /bin/busybox /usr/bin/busybox
 RUN busybox --install
-
-COPY --chown=cfu --chmod=775 --from=builder /kubectl/* /usr/local/bin/
-# ⚠️ Defaults to the latest kubectl version. Please update with new versions as needed.
+# ⚠️ We support 3 most recent minor versions: https://kubernetes.io/releases/
+# Please update `./cf-deploy-kubernetes.sh` accordingly.
+ADD --chown=cfu --chmod=775 https://dl.k8s.io/release/v1.34.1/bin/${TARGETPLATFORM}/kubectl /usr/local/bin/kubectl1.34
+ADD --chown=cfu --chmod=775 https://dl.k8s.io/release/v1.33.5/bin/${TARGETPLATFORM}/kubectl /usr/local/bin/kubectl1.33
+ADD --chown=cfu --chmod=775 https://dl.k8s.io/release/v1.32.9/bin/${TARGETPLATFORM}/kubectl /usr/local/bin/kubectl1.32
+# ⚠️ Defaults to the latest version. Please update with new versions as needed.
 RUN ln -s /usr/local/bin/kubectl1.34 /usr/local/bin/kubectl
 
 WORKDIR /