🔧 Add configuration for docker compose to start a local database server

#668

Signed-off-by: Marcus Fihlon <marcus@fihlon.swiss>

.env

@@ -0,0 +1,4 @@
+MARIADB_DATABASE=komunumo
+MARIADB_USER=komunumo
+MARIADB_PASSWORD=komunumo
+MARIADB_DATA=./.mariadb/data

.mariadb/data/README

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+This directory is used by the MariaDB database which can be run locally using Docker Compose.
+Don't delete it and don't commit it's contents.

docker-compose.yaml

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+services:
+
+  db:
+    image: mariadb:lts
+    restart: always
+    ports:
+      - "3306:3306"
+    environment:
+      MARIADB_RANDOM_ROOT_PASSWORD: true
+      MARIADB_DATABASE: ${MARIADB_DATABASE}
+      MARIADB_USER: ${MARIADB_USER}
+      MARIADB_PASSWORD: ${MARIADB_PASSWORD}
+    volumes:
+      - type: bind
+        source: ${MARIADB_DATA}
+        target: /var/lib/mysql
+
+  adminer:
+    image: adminer
+    restart: always
+    ports:
+      - "4000:8080"