optimise versionstring handling (#159)

- Reading the version string from the image updates
  it even if the image is re-pulled without re-deployment

app/Dockerfile

@@ -34,7 +34,6 @@ ARG GID
 ARG LOG_LVL
 ARG environment
 
-ENV VERSION=$VERSION
 ENV SERVICE_NAME=$SERVICE_NAME
 ENV UID=$UID
 ENV GID=$GID 
@@ -63,6 +62,7 @@ RUN python -m pip install --no-cache --no-index /root/wheels/* && \
 COPY --chmod=0700 entrypoint.sh /root/entrypoint.sh
 COPY config .
 COPY src .
+RUN echo ${VERSION} > /proxy-version.txt
 RUN date > /build-date.txt
 EXPOSE 5005 8127 10000
 

app/entrypoint.sh

@@ -2,6 +2,8 @@
 set -e
 
 user="$(id -u)"
+export VERSION=$(cat /proxy-version.txt)
+
 echo "######################################################"
 echo "# prepare: '$SERVICE_NAME' Version:$VERSION"
 echo "# for running with UserID:$UID, GroupID:$GID"