Update to python3 and elastalert v0.2.4

Dockerfile

@@ -1,5 +1,5 @@
-FROM alpine:latest as py-ea
-ARG ELASTALERT_VERSION=v0.2.0b2
+FROM alpine:3.11 as py-ea
+ARG ELASTALERT_VERSION=v0.2.4
 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 && \
@@ -18,20 +18,21 @@ RUN apk add --update --no-cache ca-certificates openssl-dev openssl python2-dev
 
 WORKDIR "${ELASTALERT_HOME}"
 
+# stick to the last 2.* version (problem with Rust dependency: https://github.com/pyca/cryptography/issues/5771)
+RUN sed -i "s/install_requires=\[/install_requires=\[\n        'cryptography<3.0'/" setup.py
+
 # 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
+RUN python3 setup.py install
 
-FROM node:alpine
+FROM node:14-alpine
 LABEL maintainer="BitSensor <[email protected]>"
 # Set timezone for this container
 ENV TZ Etc/UTC
 
-RUN apk add --update --no-cache curl tzdata python2 make libmagic
+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/python2.7/site-packages /usr/lib/python2.7/site-packages
+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/