add entrypoint

Dockerfile

@@ -9,4 +9,10 @@ RUN pip install --upgrade pip
 COPY ./requirements.txt .
 RUN pip install -r requirements.txt
 
+COPY ./entrypoint.sh .
+RUN sed -i 's/\r$//g' /usr/src/app/entrypoint.sh
+RUN chmod +x /usr/src/app/entrypoint.sh
+
 COPY . .
+
+ENTRYPOINT ["/usr/src/app/entrypoint.sh"]

entrypoint.sh

@@ -0,0 +1,16 @@
+
+if [ "$DATABASE" = "postgres" ]
+then
+    echo "Waiting for postgres..."
+
+    while ! nc -z $SQL_HOST $SQL_PORT; do
+      sleep 0.1
+    done
+
+    echo "PostgreSQL started"
+fi
+
+python manage.py flush --no-input
+python manage.py migrate
+
+exec "$@"