add postgis specific docker-compose file (#452)

install-manifests/docker-compose-postgis/README.md

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+# Hasura GraphQL Engine on Docker
+
+This Docker Compose setup runs [Hasura GraphQL Engine](https://github.com/hasura/graphql-engine) along with Postgres with the postgis extension using `docker-compose`.
+
+See [this blog post for a tutorial](https://blog.hasura.io/graphql-and-geo-location-on-postgres-using-hasura-562e7bd47a2f).
+
+## Pre-requisites
+
+- [Docker](https://docs.docker.com/install/)
+- [Docker Compose](https://docs.docker.com/compose/install/)
+
+## Usage
+
+- Clone this repo on a machine where you'd like to deploy graphql engine
+- `docker-compose up -d`
+
+GraphQL endpoint will be `https://<your-domain.com>/v1alpha1/graphql`
+Console will be available on `https://<your-domain.com>/console`
+
+## Connecting to External Postgres
+
+If you want to connect to an external/existing postgres database, replace `HASURA_GRAPHQL_DATABASE_URL` in `docker-compose.yaml` with your database url. 
+
+**Note: localhost will resolve to the container ip inside a docker container, not the host ip**
+
+

install-manifests/docker-compose-postgis/docker-compose.yaml

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+version: '3.6'
+services:
+  postgres:
+    image: mdillon/postgis
+    restart: always
+    volumes:
+    - db_data:/var/lib/postgresql/data
+  graphql-engine:
+    image: hasura/graphql-engine:v1.0.0-alpha18
+    ports:
+    - "8080:8080"
+    depends_on:
+    - "postgres"
+    restart: always
+    environment:
+      HASURA_GRAPHQL_DATABASE_URL: postgres://postgres:@postgres:5432/postgres
+    command:
+      - graphql-engine
+      - serve
+      - --enable-console
+volumes:
+  db_data: