Make changes to Docker build to support python3.

Make changes to Docker build to support python3.  See bitsensor#157

Author: jmb12686

Dockerfile

@@ -1,5 +1,5 @@
 FROM alpine:latest as py-ea
-ARG ELASTALERT_VERSION=v0.2.0b2
+ARG ELASTALERT_VERSION=1334b611fdd7adf39991a1b0b11689568d612690
 ENV ELASTALERT_VERSION=${ELASTALERT_VERSION}
 # URL from which to download Elastalert.
 ARG ELASTALERT_URL=https://github.com/Yelp/elastalert/archive/$ELASTALERT_VERSION.zip
@@ -9,7 +9,7 @@ ENV ELASTALERT_HOME /opt/elastalert
 
 WORKDIR /opt
 
-RUN apk add --update --no-cache ca-certificates openssl-dev openssl python2-dev python2 py2-pip py2-yaml libffi-dev gcc musl-dev wget && \
+RUN apk add --update --no-cache ca-certificates openssl-dev openssl python3-dev python3 py3-pip py3-yaml libffi-dev gcc musl-dev wget && \
 # Download and unpack Elastalert.
     wget -O elastalert.zip "${ELASTALERT_URL}" && \
     unzip elastalert.zip && \
@@ -19,19 +19,17 @@ RUN apk add --update --no-cache ca-certificates openssl-dev openssl python2-dev
 WORKDIR "${ELASTALERT_HOME}"
 
 # Install Elastalert.
-# see: https://github.com/Yelp/elastalert/issues/1654
-RUN sed -i 's/jira>=1.0.10/jira>=1.0.10,<1.0.15/g' setup.py && \
-    python setup.py install && \
-    pip install -r requirements.txt
+# With the latest hash we no longer need to monkey with package versions
+RUN python3 setup.py install
 
 FROM node:alpine
-LABEL maintainer="BitSensor <dev@bitsensor.io>"
+LABEL maintainer="John Belisle <jmb186@gmail.com>"
 # Set timezone for this container
-ENV TZ Etc/UTC
+ENV TZ America/New_York
 
-RUN apk add --update --no-cache curl tzdata python2 make libmagic
-
-COPY --from=py-ea /usr/lib/python2.7/site-packages /usr/lib/python2.7/site-packages
+RUN apk add --update --no-cache curl tzdata python3 make libmagic && \
+    ln -s /usr/bin/python3 /usr/bin/python
+COPY --from=py-ea /usr/lib/python3.8/site-packages /usr/lib/python3.8/site-packages
 COPY --from=py-ea /opt/elastalert /opt/elastalert
 COPY --from=py-ea /usr/bin/elastalert* /usr/bin/