Add postgis image

services/postgis/Dockerfile

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+COPY files/docker-entrypoint-initdb.d /docker-entrypoint-initdb.d
+
+ENV POSTGRES_DB=tugboat
+ENV POSTGRES_PASSWORD=tugboat
+
+HEALTHCHECK CMD /bin/nc -z 127.0.0.1 5432

services/postgis/files/docker-entrypoint-initdb.d/init-tugboat-user.sh

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+#!/bin/bash
+set -e
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+    CREATE USER tugboat WITH PASSWORD 'tugboat';
+    GRANT ALL PRIVILEGES ON DATABASE tugboat TO tugboat;
+    ALTER DATABASE tugboat OWNER TO tugboat;
+EOSQL

services/postgis/manifest

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+function getTags() {
+  ((newer_than=365*12*60*60))
+  curl -Ls https://registry.hub.docker.com/v2/repositories/postgis/postgis/tags?page_size=1024 |
+    jq -r '[.results[] | select((.images | length) > 0 and (.last_updated | sub("\\.[0-9]+Z"; "Z") | fromdate) > (now - '"$newer_than"')) | {name: .name, digest: .images[0].digest}] | group_by(.digest) | map([.[].name] | join(",")) | .[]' |
+    grep -v -e beta -e rc -e alpine
+}
+NAME="tugboat-postgis"
+FROM="postgis/postgis"

services/postgis/run

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+#!/bin/sh
+exec docker-entrypoint.sh postgres