feat: add 5etools service configuration to Docker Compose

Co-authored-by: Copilot <copilot@github.com>

nodes/heimdall/5etools/compose.yaml

@@ -0,0 +1,21 @@
+services:
+# https://github.com/Jafner/5etools-docker
+  5etools:
+    restart: unless-stopped
+    container_name: 5etools
+    image: jafner/5etools-docker
+    volumes:
+      - /mnt/appdata/5etools/data:/usr/local/apache2/htdocs
+      - /mnt/appdata/5etools/data/homebrew/index.json:/usr/local/apache2/htdocs/homebrew/index.json:ro # try to prevent overwriting custom index on restart
+    environment:
+      - SOURCE=GITHUB
+      - IMG=TRUE
+      # Use the 2014 Rules
+      - DL_LINK=https://github.com/5etools-mirror-3/5etools-2014-src.git
+      - IMG_LINK=https://github.com/5etools-mirror-3/5etools-2014-img.git
+    networks:
+      - proxy-net
+
+networks:
+  proxy-net:
+    external: true