Add Dockerfile for an Alpine Linux based image.

Dockerfile-gnm-test

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+FROM alpine:latest
+
+RUN apk update && apk upgrade && \
+   apk add tzdata python py-yaml curl wget bash python-dev git && \
+   apk add build-base && \ 
+   # Install setuptools
+   curl https://bootstrap.pypa.io/ez_setup.py -o - | python && \
+   # install supervisord
+   easy_install supervisor && \
+   # Checkout Yelp/elastalert
+   mkdir -p /usr/src && \
+   cd /usr/src/ && \
+   git clone https://github.com/Yelp/elastalert.git && \
+   # Build elastalert
+   cd /usr/src/elastalert/ && \
+   python setup.py install && \
+   # Setup config directory
+   sed -i 's/example_rules/rules/g' config.yaml.example && \
+   mkdir -p /opt/elastalert/rules && \
+   mv config.yaml.example /opt/elastalert/config.yaml && \
+   mv supervisord.conf.example /opt/elastalert/supervisord.conf && \
+   sed -i -e 's/nodaemon=false/nodaemon=true/' /opt/elastalert/supervisord.conf && \
+   ln -s $(find /usr/lib/python* -name elastalert.py) /opt/elastalert/elastalert.py && \
+   # Include example_rules folder
+   mkdir -p /opt/elastalert/example_rules && \
+   cp example_rules/* /opt/elastalert/example_rules/ && \
+   # Remove files to save space
+   cd / && \
+   rm -rf /usr/src/elastalert && \
+   apk del python-dev git && \
+   rm -rf /var/cache/apk/* && \
+   cp /usr/share/zoneinfo/America/New_York /etc/localtime && \
+   echo "America/New_York" >  /etc/timezone && \
+   echo "EST5EDT" >  /etc/TZ && \ 
+   apk del build-base
+
+WORKDIR /opt/elastalert
+
+ONBUILD COPY config.yaml /opt/elastalert/config.yaml
+ONBUILD COPY rules/* /opt/elastalert/rules/
+VOLUME ["/opt/elastalert"]
+VOLUME ["/var/log"]
+
+CMD ["supervisord","-c","/opt/elastalert/supervisord.conf"]
+
+COPY Dockerfile /Dockerfile

Dockerfile-test-alpine

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+FROM alpine:latest
+
+RUN apk update && apk upgrade -f && \
+    apk add -f build-base python python-dev py-setuptools openssl-dev git py-tox py-pip libffi-dev && \
+    mkdir -p /home/elastalert
+
+WORKDIR /home/elastalert
+
+ADD . ./
+RUN pip install -r requirements-dev.txt && \
+    python setup.py install 
+
+