Add the src code for the swarm-demo-db service

[refs %fe270e7659a4]

Author: jfahrer

swarm/swarm-demo-db/Dockerfile

@@ -0,0 +1,3 @@
+FROM postgres:9.6-alpine
+
+COPY create_table.sql /docker-entrypoint-initdb.d/create_table.sql

swarm/swarm-demo-db/create_table.sql

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+CREATE TABLE IF NOT EXISTS requests (
+  id serial primary key,
+  requested_at character varying,
+  ip character varying,
+  host character varying,
+  path character varying
+);

swarm/swarm-demo-db/docker-compose.yml

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+version: "3.3"
+
+services:
+  db:
+    image: jfahrer/swarm-demo-db:v1
+    build:
+      context: .