feat: Added docker image

Dockerfile

@@ -0,0 +1,49 @@
+# Stage 1 Build myks
+FROM golang:1.20 AS builder
+COPY . /app
+WORKDIR /app
+RUN go mod download && \
+    go mod verify
+RUN CGO_ENABLED=0 \
+    go build -trimpath -o myks main.go
+
+# Stage 2 Download tools
+FROM debian:bookworm AS download-tools
+ARG HELM_VERSION=3.11.2
+ARG VENDIR_VERSION=0.33.1
+ARG YTT_VERSION=0.45.0
+RUN apt-get update \
+  && apt-get install --no-install-recommends -y \
+  ca-certificates \
+  curl \
+  unzip
+ENV TOOLS_ROOT=/tools
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+RUN mkdir ${TOOLS_ROOT} && \
+  curl -fsSL \
+  https://get.helm.sh/helm-v${HELM_VERSION}-linux-amd64.tar.gz | \
+  tar -xzf - -C ${TOOLS_ROOT} --strip-components=1 linux-amd64/helm && \
+  curl -fsSL \
+  https://github.com/vmware-tanzu/carvel-vendir/releases/download/v${VENDIR_VERSION}/vendir-linux-amd64 \
+  > ${TOOLS_ROOT}/vendir && \
+  curl -fsSL \
+  https://github.com/vmware-tanzu/carvel-ytt/releases/download/v${YTT_VERSION}/ytt-linux-amd64 \
+  > ${TOOLS_ROOT}/ytt
+RUN chmod +x ${TOOLS_ROOT}/*
+
+# Stage 3: Bring it all together
+FROM debian:bookworm
+RUN apt-get update \
+  && apt-get install --no-install-recommends -y \
+  ca-certificates \
+  git \
+  gnupg2 \
+  ssh \
+  tini && \
+  rm -rf /var/lib/apt/lists/*
+ENV TOOLS_ROOT=/tools
+WORKDIR /app
+ENV PATH="${PATH}:${TOOLS_ROOT}"
+COPY --from=download-tools ${TOOLS_ROOT} ${TOOLS_ROOT}
+COPY --from=builder app/myks ${TOOLS_ROOT}
+ENTRYPOINT ["tini", "--", "myks"]