Optim: using alpine linux as base

Feature: add gocd-agent-docker

gocd-agent-docker/Dockerfile

@@ -0,0 +1,36 @@
+FROM docker
+
+ENV JAVA_HOME="/usr/lib/jvm/default-jvm"
+
+RUN apk update \
+    && apk add --no-cache \
+       curl \
+       git \
+       subversion \
+       openjdk7-jre-base \
+       bash \
+    && ln -fs /bin/bash /bin/sh
+
+# Installing Go agent
+WORKDIR /var/lib
+RUN curl -sL -o go-agent-16.1.0.zip "https://download.go.cd/binaries/16.1.0-2855/generic/go-agent-16.1.0-2855.zip" \
+    && unzip go-agent-16.1.0.zip \
+    && mv go-agent-16.1.0 go-agent \
+    && rm go-agent-16.1.0.zip
+
+RUN rm -rf /tmp/* /var/tmp/* /var/cache/apk/*
+
+RUN git config --global url."https://".insteadOf git://
+
+#VOLUME ["/var/lib/go-agent", "/var/log/go-agent", "/var/go/.ssh"]
+
+COPY autoregister.properties /var/lib/go-agent/config/autoregister.properties
+
+#ENTRYPOINT ["/bin/bash", "-c"]
+
+CMD until curl -s -o /dev/null "http://${GO_SERVER}:${GO_SERVER_PORT}"; do sleep 5; done; \
+    if [ -n "$AGENT_KEY" ]; then \
+        sed -i -e 's/=.*/=/g' -e "s/key=/key=$AGENT_KEY/" -e "s/resources=/resources=$AGENT_RESOURCES/" /var/lib/go-agent/config/autoregister.properties; \ 
+    fi; \
+    (/var/lib/go-agent/agent.sh &); while [ ! -f /var/lib/go-agent/go-agent-bootstrapper.log ]; do sleep 1; done; exec tail -F /var/lib/go-agent/*.log
+