Merge pull request #1 from usds/pgserver

Adding not-production-ready dockerized pg_tileserv server, mostly for local development

.gitignore

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+*.env

server/README.md

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+# Tile Server
+
+## What is it?
+
+A simple tile server using [pg_tileserv](https://github.com/CrunchyData/pg_tileserv), based on pg_tileserv [docker example](https://github.com/CrunchyData/pg_tileserv/tree/master/examples/docker).
+
+## How to use it?
+
+1. Edit variables in `docker-compose.yml` if necessary to customize username/pw
+2. Run `docker-compose up` to start running the server. It will likely stall in enabling extensions (TODO: figure this out))
+3. Restart the server with ctrl-c. It should load the data from the `data/` directory exactly one time.
+
+## Using
+
+- Point your visualization library to the following URL, and select `vector` tiles: `http://localhost:7800/public.maryland/{z}/{x}/{y}.mvt`

server/docker-compose.yml

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+version: "3.9"
+
+services:
+  tileserv:
+    image: pramsey/pg_tileserv:20210210
+    environment:
+      - DATABASE_URL=postgresql://map_dev_user:map_pwd@db/map_dev
+    depends_on:
+      db:
+        condition: service_healthy
+    ports:
+      - 7800:7800
+    restart: unless-stopped
+  db:
+    image: kartoza/postgis:13-3.1
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+      - ./data:/work
+      - ./load-data-db.sh:/docker-entrypoint-initdb.d/load_data-db.sh
+    environment:
+      - POSTGRES_USER=map_dev_user
+      - POSTGRES_PASS=map_pwd
+      - POSTGRES_DB=map_dev
+      - ALLOW_IP_RANGE=0.0.0.0/0
+    ports:
+      - 5434:5432
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U map_dev_user -d map_dev"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    restart: unless-stopped
+volumes:
+  pgdata:

server/load-data-db.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# echo "[SQL INIT SCRIPT] Creating extension..."
+# psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "gis" <<-EOSQL
+#     CREATE EXTENSION IF NOT EXISTS postgis;
+# EOSQL
+
+# Load Maryland geojson
+echo "[SQL INIT SCRIPT] Loading data from geojson..."
+ogr2ogr -progress -f PostgreSQL PG:"host=localhost dbname=map_dev user=map_dev_user password=map_pwd" /work/maryland.geojson -nln maryland
+echo "Data load complete"