Add functionality and instructions

.env.template

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+OSKARI_DB_PORT=5433
+OSKARI_DB_USER=oskari
+OSKARI_DB_PASSWORD=oskari

.gitignore

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+.env*
+!.env.template

README.md

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 # oskari-database-docker
-Minimal working database setup for Oskari
+
+This Docker container provides a minimal working database setup for Oskari, intended for use in Oskari development. It initializes the Oskari database following the guidelines outlined in the [Oskari documentation](https://oskari.org/documentation/docs/latest/3-Setup-instructions#Setup-database).
+
+## Requirements
+
+- Docker Compose (tested with Docker Desktop v.4.17)
+
+## Steps to run
+
+1. Copy the environment template
+
+- copy .env.template to .env
+
+2. Edit environment variables
+
+- edit environment variables in .env
+  - OSKARI_DB_PORT - database port
+  - OSKARI_DB_USER - username for the Oskari database
+  - OSKARI_DB_PASSWORD - password for the Oskari database user
+
+3. Start the database
+
+- docker compose up db

docker-compose.yml

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+volumes:
+  postgis-data:
+    driver: local
+
+services:
+  db:
+    image: oskari/postgis
+    build:
+      context: ./postgis
+    volumes:
+      - postgis-data:/var/lib/postgresql/data
+      - ./postgis/scripts:/docker-entrypoint-initdb.d/
+    environment:
+      - POSTGRES_DB=oskaridb
+      - POSTGRES_USER=$OSKARI_DB_USER
+      - POSTGRES_PASSWORD=$OSKARI_DB_PASSWORD
+    ports:
+      - ${OSKARI_DB_PORT}:5432

postgis/Dockerfile

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+FROM postgres:14
+
+ENV POSTGIS_MAJOR 3
+
+RUN apt-get update \
+     && apt-cache showpkg postgresql-$PG_MAJOR-postgis-$POSTGIS_MAJOR \
+     && apt-get install -y --no-install-recommends \
+     postgresql-$PG_MAJOR-postgis-$POSTGIS_MAJOR \
+     postgresql-$PG_MAJOR-postgis-$POSTGIS_MAJOR-scripts \
+     && rm -rf /var/lib/apt/lists/*

postgis/scripts/init_oskari.sql

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+CREATE EXTENSION postgis;