Use docker container with ip4r installed (#698)

* Use docker container with ip4r installed

* Credit source

---------

Co-authored-by: ekzyis <ek@stacker.news>

db/Dockerfile

@@ -0,0 +1,6 @@
+# https://github.com/JonasProgrammer/docker-postgres-ip4r
+FROM postgres:13.2
+
+RUN apt-get update \
+    && apt-get install --no-install-recommends -y postgresql-13-ip4r \
+    && rm -rf /var/lib/apt/lists/*

docker-compose.yml

@@ -2,7 +2,7 @@ version: "3"
 services:
   db:
     container_name: db
-    image: postgres:13.2
+    build: ./db
     restart: always
     expose:
       - "5432"