Commit Dockerfile for kubeval tools

Dockerfile

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+FROM python:3.8-alpine3.10
+
+ARG APP_VERSION=1.0
+
+# https://github.com/kubernetes/kubectl/releases
+ARG KUBECTL_VERSION=1.16.2
+
+# https://github.com/instrumenta/kubeval/releases
+ARG KUBEVAL_VERSION=0.14.0
+
+# https://pypi.org/project/yamllint/
+ARG YAMLLINT_VERSION=1.18.0
+
+# https://github.com/kubernetes-sigs/kustomize/releases
+ARG KUSTOMIZE_VERSION=3.3.0
+
+# split layers into distinct components
+RUN apk add --no-cache ca-certificates curl
+
+# Install Kubeval
+RUN  mkdir /tmp/kubeval \
+    && curl -L -o /tmp/kubeval/kubeval.tar.gz \
+      https://github.com/instrumenta/kubeval/releases/download/${KUBEVAL_VERSION}/kubeval-linux-amd64.tar.gz \
+    && tar xf /tmp/kubeval/kubeval.tar.gz -C /tmp/kubeval \
+    && mv /tmp/kubeval/kubeval /usr/local/bin \
+    && chmod +x /usr/local/bin/kubeval \
+    && rm -rf /tmp/kubeval
+
+# Install yamllint
+RUN pip install yamllint==${YAMLLINT_VERSION} && \
+    rm -rf ~/.cache/pip
+
+# Install Kustomize
+RUN mkdir /tmp/kustomize \
+  && curl -L -o /tmp/kustomize/kustomize.tar.gz \
+  https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv${KUSTOMIZE_VERSION}/kustomize_v${KUSTOMIZE_VERSION}_linux_amd64.tar.gz \
+  && tar xf /tmp/kustomize/kustomize.tar.gz -C /tmp/kustomize \
+  && mv /tmp/kustomize/kustomize /usr/local/bin \
+  && chmod +x /usr/local/bin/kustomize \
+  && rm -rf /tmp/kustomize
+
+# Install Kubectl
+RUN curl -o /usr/local/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/v${KUBECTL_VERSION}/bin/linux/amd64/kubectl \
+    && chmod +x /usr/local/bin/kubectl
+
+CMD ["/bin/sh"]
+