Add docker-compose snippets

content/docs/software/docker.adoc

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+
+:source-highlighter: pygments
+
+== Docker
+
+=== Compose file snippets
+
+==== General template
+
+[source,yaml]
+----
+version: '3.7'
+
+services:
+  name:
+    image: x/y:z
+    volumes:
+      - host/path:/container/path
+      - custom:/container/path
+    environment:
+      FOO: bar
+    restart: always
+
+networks:
+  custom:
+    external: true
+
+volumes:
+  custom:
+----
+
+==== MySQL/MariaDB
+
+[source,yaml]
+----
+  db:
+    image: mariadb:latest
+    volumes:
+      - mariadb_data:/var/lib/mysql
+    restart: always
+    environment:
+      MYSQL_DATABASE: app_name
+      MYSQL_USER: app_name
+      MYSQL_PASSWORD: app_password
+      MYSQL_ROOT_PASSWORD: random_password
+----