add dev tools

Author: kameshsampath

Dockerfile

@@ -0,0 +1,63 @@
+FROM alpine
+
+# Ignore to update versions here
+# docker build --no-cache --build-arg KUBECTL_VERSION=${tag} --build-arg HELM_VERSION=${helm} --build-arg KUSTOMIZE_VERSION=${kustomize_version} -t ${image}:${tag} .
+ARG HELM_VERSION=3.9.0
+ARG KUBECTL_VERSION=1.24.1
+ARG KUSTOMIZE_VERSION=v4.5.5
+
+# Install helm (latest release)
+# ENV BASE_URL="https://storage.googleapis.com/kubernetes-helm"
+ENV BASE_URL="https://get.helm.sh"
+ENV TAR_FILE="helm-v${HELM_VERSION}-linux-amd64.tar.gz"
+RUN apk add --update --no-cache curl ca-certificates bash git && \
+    curl -sL ${BASE_URL}/${TAR_FILE} | tar -xvz && \
+    mv linux-amd64/helm /usr/bin/helm && \
+    chmod +x /usr/bin/helm && \
+    rm -rf linux-amd64
+
+# add helm-diff
+RUN helm plugin install https://github.com/databus23/helm-diff && rm -rf /tmp/helm-*
+
+# add helm-unittest
+RUN helm plugin install https://github.com/quintush/helm-unittest && rm -rf /tmp/helm-*
+
+# add helm-push
+RUN helm plugin install https://github.com/chartmuseum/helm-push && rm -rf /tmp/helm-*
+
+# Install kubectl (same version of aws esk)
+RUN curl -sLO https://storage.googleapis.com/kubernetes-release/release/v${KUBECTL_VERSION}/bin/linux/amd64/kubectl && \
+    mv kubectl /usr/bin/kubectl && \
+    chmod +x /usr/bin/kubectl
+
+# Install kustomize (latest release)
+RUN curl -sLO https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2F${KUSTOMIZE_VERSION}/kustomize_${KUSTOMIZE_VERSION}_linux_amd64.tar.gz && \
+    tar xvzf kustomize_${KUSTOMIZE_VERSION}_linux_amd64.tar.gz && \
+    mv kustomize /usr/bin/kustomize && \
+    chmod +x /usr/bin/kustomize
+
+# Install jq
+RUN apk add --update --no-cache jq
+
+# Install yq
+RUN apk add --update --no-cache yq
+
+# Install for envsubst
+RUN apk add --update --no-cache gettext
+
+# Install yq
+RUN apk add --update --no-cache yq
+
+# Install kubens
+RUN curl -sL -o /usr/local/bin/kubens https://raw.githubusercontent.com/ahmetb/kubectx/master/kubens \
+  && chmod +x /usr/local/bin/kubens
+
+# Install kubectx
+RUN curl -sL -o /usr/local/bin/kubectx https://raw.githubusercontent.com/ahmetb/kubectx/master/kubectx \
+  && chmod +x /usr/local/bin/kubectx
+
+WORKDIR /apps
+
+RUN mkdir -p /apps/.kube
+
+ENV KUBECONFIG=/apps/.kube/config