Add local_pip source and add healthcheck.

Author: rouilj

scripts/Dockerfile

@@ -13,7 +13,9 @@
 # application directory
 ARG appdir=/usr/src/app
 
-# support roundup install from 'local' directory or from 'pypi'
+# support roundup install from 'local' directory,
+# 'local_pip' local directory using pip to install or
+# latest release from 'pypi'
 ARG source=local
 
 FROM python:3-alpine as build
@@ -100,6 +102,9 @@ EXPOSE 8080/tcp
 RUN mkdir tracker
 VOLUME $appdir/tracker
 
+HEALTHCHECK --start-period=1m \
+   CMD wget -q -O /dev/null --no-verbose http://localhost:8080/issues/
+
 # do not run roundup as root
 RUN adduser -D -h /usr/src/app roundup
 USER roundup