tidy up docker file and apk command

Dockerfile

@@ -159,8 +159,9 @@ RUN GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8 \
 
 RUN echo @testing http://nl.alpinelinux.org/alpine/edge/testing >> /etc/apk/repositories && \
     echo /etc/apk/respositories && \
-    apk update && \
-    apk add --no-cache bash \
+    apk update && apk upgrade &&\
+    apk add --no-cache --virtual .sys-deps \
+    bash \
     openssh-client \
     wget \
     supervisor \
@@ -210,7 +211,8 @@ RUN echo @testing http://nl.alpinelinux.org/alpine/edge/testing >> /etc/apk/repo
     pip install -U pip && \
     pip install -U certbot && \
     mkdir -p /etc/letsencrypt/webrootauth && \
-    apk del gcc musl-dev linux-headers libffi-dev augeas-dev python-dev make autoconf
+#    apk del gcc musl-dev linux-headers libffi-dev augeas-dev python-dev make autoconf && \
+    apk del .sys-deps
 #    ln -s /usr/bin/php7 /usr/bin/php
 
 ADD conf/supervisord.conf /etc/supervisord.conf