Add sanitized compose files for 21 rocky-docker stacks missing from the mirror

audiobookshelf, bazarr, beets, dashy, dockhand, docker-socket-proxy,
emby, ghost (+umami), jellyfin, kodi-mariadb, kopia, lidarr,
music-assistant, prowlarr, qbittorrent, radarr, seerr, sonarr, tdarr,
tinymediamanager, trilium — these run in the fleet today but had no
public entry at all. Same sanitization convention as the rest of the
repo (paths -> /path/to/..., secrets left as bare ${VAR} refs, no CA
trust details).

Docker/Kopia/docker-compose.yaml

@@ -0,0 +1,34 @@
+services:
+  kopia:
+    image: kopia/kopia:latest
+    container_name: kopia
+    restart: unless-stopped
+    user: "0:0"
+    hostname: "docker-host"
+    ports:
+      - "${HTTP_PORT}:51515"
+    command:
+      - server
+      - start
+      - --address=0.0.0.0:51515
+      - --tls-cert-file=/tls/kopia.crt
+      - --tls-key-file=/tls/kopia.key
+      - --server-username=${USERNAME}
+      - --server-password=${SECRET_PASSWORD}
+      - --disable-csrf-token-checks
+    environment:
+      TZ: ${TZ}
+      KOPIA_PASSWORD: ${SECRET_PASSWORD}
+    volumes:
+      - /path/to/backup-drive/kopia-repo:/repository # External drive for repository
+      - /path/to/backup-drive/kopia-cache:/cache
+      - /path/to/backup-drive/kopia-config:/app/config
+      - /path/to/backup-drive/kopia-tls:/tls:ro
+      - /path/to/docker-volumes:/apps:ro # Read-only access to docker volumes
+      - /path/to/docker-volumes:/restore
+    networks:
+      - kopia-net
+
+networks:
+  kopia-net:
+    external: true