Add water as first example layer

.env

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+POSTGRES_DB=osm
+POSTGRES_USER=osm
+POSTGRES_PASSWORD=osm
+POSTGRES_HOST=postgres
+POSTGRES_PORT=5432

data.yml

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+_prefs: 
+  disabled: []
+  inspector: false
+  mapid: ''
+  rev: ''
+  saveCenter: true
+attribution: "<a href=\"http://www.openstreetmap.org/about/\" target=\"_blank\">&copy; OpenStreetMap contributors</a>"
+center: 
+  - 8.6627
+  - 47.3872
+  - 0
+description: "Free global vector tiles from OpenStreetMap. http://osm2vectortiles.org"
+Layer: 
+  - id: water
+    Datasource: 
+      dbname: osm
+      extent: -20037508.34,-20037508.34,20037508.34,20037508.34
+      geometry_field: geom
+      geometry_table: ''
+      host: db
+      key_field: ''
+      key_field_as_attribute: ''
+      max_size: 512
+      password: osm
+      port: 5432
+      srid: ''
+      table: |-
+        ( SELECT *
+          FROM (
+              SELECT * FROM water_z0
+              WHERE z(!scale_denominator!) = 0
+              UNION ALL
+              SELECT * FROM water_z1
+              WHERE z(!scale_denominator!) = 1
+              UNION ALL
+              SELECT * FROM water_z2
+              WHERE z(!scale_denominator!) BETWEEN 2 AND 3
+              UNION ALL
+              SELECT * FROM water_z4
+              WHERE z(!scale_denominator!) = 4
+              UNION ALL
+              SELECT * FROM water_z5
+              WHERE z(!scale_denominator!) = 5
+          ) AS water
+          WHERE geom && !bbox!
+        ) AS data
+      type: postgis
+      user: osm
+    description: Ocean and lake polygons
+    fields: {}
+    properties: 
+      "buffer-size": 4
+    srs: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over
+maxzoom: 14
+minzoom: 0
+name: OSM2VectorTiles v3.0

docker-compose.yml

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+version: '2'
+volumes:
+  pgdata:
+services:
+  postgres:
+    image: "osm2vectortiles/postgis:latest"
+    volumes:
+     - pgdata:/var/lib/postgresql/data
+    ports:
+     - "5432"
+    env_file: .env
+  db-schema:
+    build: "./schema"
+    env_file: .env
+    links:
+    - postgres:postgres
+  import-natural-earth:
+    image: "osm2vectortiles/import-natural-earth"
+    env_file: .env
+    links:
+    - postgres
+  import-water:
+    image: "osm2vectortiles/import-water"
+    env_file: .env
+    links:
+    - postgres
+  mapbox-studio:
+    image: "osm2vectortiles/mapbox-studio"
+    volumes:
+     - ./:/projects/osm2vectortiles.tm2source
+    links:
+     - postgres:db
+    ports:
+     - "3000:3000"

schema/Dockerfile

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+FROM osm2vectortiles/postgis:latest
+MAINTAINER Lukas Martinelli <me@lukasmartinelli.ch>
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+      ca-certificates \
+      wget \
+ && rm -rf /var/lib/apt/lists/*
+
+ENV VT_UTIL_DIR=/opt/postgis-vt-util \
+    VT_UTIL_URL="https://raw.githubusercontent.com/mapbox/postgis-vt-util/v1.0.0/postgis-vt-util.sql"
+
+RUN mkdir -p "$VT_UTIL_DIR" \
+ && wget -P "$VT_UTIL_DIR" --quiet "$VT_UTIL_URL"
+
+COPY . /usr/src/app/
+WORKDIR /usr/src/app
+CMD ["./create_schema.sh"]

schema/create_schema.sh

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+#!/bin/bash
+set -o errexit
+set -o pipefail
+set -o nounset
+
+function exec_psql_file() {
+    local file_name="$1"
+    PGPASSWORD="$POSTGRES_PASSWORD" psql \
+        -v ON_ERROR_STOP="1" \
+        --host="$POSTGRES_HOST" \
+        --port="$POSTGRES_PORT" \
+        --dbname="$POSTGRES_DB" \
+        --username="$POSTGRES_USER" \
+        -f "$file_name"
+}
+
+function main() {
+    exec_psql_file "$VT_UTIL_DIR/postgis-vt-util.sql"
+    exec_psql_file "layers/water.sql"
+}
+
+main

schema/layers/water.sql

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+CREATE OR REPLACE VIEW water_z0 AS (
+    SELECT geom FROM ne_110m_ocean
+    UNION ALL
+    SELECT geom FROM ne_110m_lakes
+);
+
+CREATE OR REPLACE VIEW water_z1 AS (
+    SELECT geom FROM ne_110m_ocean
+    UNION ALL
+    SELECT geom FROM ne_110m_lakes
+);
+
+CREATE OR REPLACE VIEW water_z2 AS (
+    SELECT geom FROM ne_50m_ocean
+    UNION ALL
+    SELECT geom FROM ne_110m_lakes
+);
+
+CREATE OR REPLACE VIEW water_z4 AS (
+    SELECT geom FROM ne_10m_ocean
+    UNION ALL
+    SELECT geom FROM ne_50m_lakes
+);
+
+CREATE OR REPLACE VIEW water_z5 AS (
+    SELECT geom FROM ne_10m_ocean
+    UNION ALL
+    SELECT geom FROM ne_10m_lakes
+);