Add Dockerfile

Dockerfile

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+FROM alpine:3.10 as build
+ARG branch=release
+ARG gradle_version=5.2.1
+RUN mkdir /root/.ssh
+COPY id_rsa /root/.ssh
+RUN apk add --update --no-cache wget figlet unzip maven openjdk8 git openssh bash ansible \
+    && wget https://services.gradle.org/distributions/gradle-${gradle_version}-bin.zip -q -P /tmp \
+    && unzip -d /opt/gradle /tmp/gradle-${gradle_version}-bin.zip \
+    && export GRADLE_HOME=/opt/gradle/gradle-${gradle_version} \
+    && export PATH=${GRADLE_HOME}/bin:${PATH} \
+    && gradle -v