replace graphiql with playground, add docker-compose with postgresql and init scripts

Author: federico silva

build.sbt

@@ -105,5 +105,6 @@ lazy val core = project
       "org.http4s"           %% "http4s-circe"        % http4sVersion,
       "io.circe"             %% "circe-optics"        % circeVersion,
       "org.slf4j"            %  "slf4j-simple"        % slf4jVersion
-    )
+    ),
+    
   )

docker-compose.yml

@@ -0,0 +1,22 @@
+# Use postgres/example user/password credentials
+version: '3.1'
+
+services:
+
+  db:
+    image: postgres
+    restart: always
+    environment:
+      POSTGRES_USER: user
+      POSTGRES_PASSWORD: password
+      POSTGRES_DB: world
+    ports:
+      - 5432:5432
+    volumes:
+      - ./init/:/docker-entrypoint-initdb.d/
+
+  adminer:
+    image: adminer
+    restart: always
+    ports:
+      - 8686:8080

init/01-tables.sql

@@ -0,0 +1,8 @@
+create table cities
+(
+  id         serial       primary key not null,
+  name       varchar(100) not null,
+  country_id varchar(2)   not null,
+  district   varchar(20)  not null,
+  population bigint
+);

init/02-cities-data.sql

@@ -0,0 +1,7 @@
+
+INSERT INTO cities (name, country_id, district, population)
+values
+       ('Montevideo',     'UY', 'Montevideo', 150000),
+       ('Paysandú',       'UY', 'Paysandú',   75000),
+       ('New York',       'US', 'New York',   8623000000),
+       ('San Francisco',  'US', 'California', 884363  )