[HDX-7970] bump alpine to 3.14 (#13)

Dockerfile

@@ -1,16 +1,23 @@
-FROM unocha/alpine-base-s6-python2:3.8
+FROM public.ecr.aws/unocha/python2-base-s6:2
 
 WORKDIR /srv/dataproxy
 
 COPY . .
 
 RUN apk add --update-cache \
-        git \
-        py-lxml \
+        libxml2 \
+        libxslt \
         libffi-dev && \
+    apk add --virtual .build-deps \
+        build-base \
+        libxml2-dev \
+        libxslt-dev \
+        python2-dev && \
     pip install --upgrade \
         pip \
+        lxml \
         gunicorn \
+        gevent \
         html5lib \
         xlrd==1.2.0 \
         python-dateutil==2.8.0 \
@@ -24,13 +31,7 @@ RUN apk add --update-cache \
     # this is done through actions./checkout && \
     # git submodule init dataproxy && \
     # git submodule update dataproxy && \
-    apk add --update-cache \
-        build-base \
-        python-dev && \
-    pip install gevent && \
-    apk del \
-        build-base \
-        python-dev && \
+    apk del .build-deps && \
     rm -r /root/.cache && \
     rm -rf /var/cache/apk/*