Add Dockerfile

Dockerfile

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+FROM alpine
+
+RUN apk update && \
+    apk --no-cache add ca-certificates openssl python2 py2-pip py2-yaml tzdata
+
+ENV ELASTALERT_HOME /opt/elastalert/
+
+WORKDIR /opt
+
+ADD setup.py requirements.txt elastalert "${ELASTALERT_HOME}"
+
+WORKDIR "${ELASTALERT_HOME}"
+
+RUN apk --no-cache add --virtual build-dependencies python2-dev musl-dev gcc openssl-dev libffi-dev && \
+    pip install -r requirements.txt && \
+    python setup.py install && \
+    apk del build-dependencies
+
+CMD [ "python", "-m", "elastalert", "--config", "/opt/config/elastalert_config.yaml", "--verbose" ]