feat: Add Docker Compose configuration for Siyuan with an example environment file.

siyuan/docker-compose.yaml

@@ -0,0 +1,12 @@
+services:
+  siyuan:
+    image: b3log/siyuan
+    container_name: siyuan
+    command: [ "--workspace=/siyuan/workspace", "--accessAuthCode=${SIYUAN_ACCESS_CODE}" ]
+    ports:
+      - "${SIYUAN_PORT}:6800"
+    volumes:
+      - "${SIYUAN_DATA_DIR}:/siyuan/workspace"
+    restart: unless-stopped
+    environment:
+      - TZ=${TZ}