Create Dockerfile

.azure/Dockerfile

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+FROM ubuntu:18.04
+
+# Set shell
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# Docker
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        apt-transport-https \
+        ca-certificates \
+        curl \
+        gpg-agent \
+        software-properties-common \
+    && curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - \
+    && add-apt-repository "deb https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" \
+    && apt-get update && apt-get install -y --no-install-recommends \
+        docker-ce \
+    && rm -rf /var/lib/apt/lists/*
+
+# Build Tools
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        wget patch vim cpio python unzip rsync bc bzip2 ncurses-dev sudo \
+        git make g++ file perl bash binutils locales qemu-utils bison flex \
+    && rm -rf /var/lib/apt/lists/*