Use tini as init container in Dockerfile

Author: woodlee

Dockerfile

@@ -21,4 +21,10 @@ COPY requirements.txt .
 RUN pip install -r requirements.txt
 
 COPY plan_monitor ./plan_monitor
-ENTRYPOINT ["python", "-m"]
+
+ENV TINI_VERSION v0.19.0
+ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
+RUN chmod +x /tini
+
+ENTRYPOINT ["/tini", "--"]
+CMD ["python", "-m"]