Add initial configuration for Bookstack with environment variables

.env.sample

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+MYSQL_ROOT_PASSWORD=
+MYSQL_PASSWORD=
+MYSQL_DATABASE=bookstackapp
+MYSQL_USER=bookstack
+
+APP_URL=http://localhost:6875

docker-compose.yml

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+version: "3.7"
+
+services:
+    bookstack:
+        image: ghcr.io/linuxserver/bookstack
+        container_name: bookstack
+        environment:
+            - PUID=1000
+            - PGID=1000
+            - APP_URL=${APP_URL}
+            - DB_HOST=bookstack_db
+            - DB_USER=${MYSQL_USER}
+            - DB_PASS=${MYSQL_PASSWORD}
+            - DB_DATABASE=${MYSQL_DATABASE}
+        volumes:
+            - ./config/bookstack:/config
+        ports:
+            - 6875:80
+        restart: unless-stopped
+        depends_on:
+            - bookstack_db
+
+    bookstack_db:
+        image: ghcr.io/linuxserver/mariadb
+        container_name: bookstack_db
+        environment:
+            - PUID=1000
+            - PGID=1000
+            - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
+            - TZ=Europe/Copenhagen
+            - MYSQL_DATABASE=${MYSQL_DATABASE}
+            - MYSQL_USER=${MYSQL_USER}
+            - MYSQL_PASSWORD=${MYSQL_PASSWORD}
+        volumes:
+            - ./config/db:/config
+        restart: unless-stopped

start.sh

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+docker-compose --env-file .env up -d