ci: add Forgejo Actions CI/CD pipeline for build, push and prod deploy

Mirrors the LichessStatTgWeb pipeline: build all 7 service images,
push to the Gitea registry, transfer to the prod host via docker
save/load (registry isn't reachable from the external VPS), and
redeploy with docker-compose.prod.yml.

docker-compose.yml

@@ -1,6 +1,7 @@
 services:
   bot:
     build: .
+    image: 192.168.8.174:3000/vrubel/video-bot:latest
     container_name: video_download_bot
     restart: unless-stopped
     env_file:
@@ -22,6 +23,7 @@ services:
 
   admin_bot:
     build: .
+    image: 192.168.8.174:3000/vrubel/video-admin-bot:latest
     container_name: admin_bot
     restart: unless-stopped
     env_file:
@@ -32,3 +34,64 @@ services:
       - ./data:/app/data:Z
     network_mode: host
     command: python admin_bot.py
+
+  youtube-downloader:
+    build: ./youtube-downloader
+    image: 192.168.8.174:3000/vrubel/video-youtube:latest
+    container_name: youtube_downloader_service
+    restart: unless-stopped
+    volumes:
+      - ./youtube-downloader/downloads:/app/downloads
+    environment:
+      - YOUTUBE_COOKIES_FILE=/app/youtube_cookies.txt
+      - PORT=5557
+    network_mode: host
+
+  instagram-downloader:
+    build: ./instagram-downloader
+    image: 192.168.8.174:3000/vrubel/video-instagram:latest
+    container_name: instagram_downloader_service
+    restart: unless-stopped
+    network_mode: host
+    volumes:
+      - ./instagram-downloader/downloads:/app/downloads
+    environment:
+      - INSTAGRAM_COOKIES_FILE=/app/instagram_cookies.txt
+      - PORT=5556
+
+  vk-downloader:
+    build: ./vk-downloader
+    image: 192.168.8.174:3000/vrubel/video-vk:latest
+    container_name: vk_downloader_service
+    restart: unless-stopped
+    network_mode: host
+    volumes:
+      - ./vk-downloader/downloads:/app/downloads
+    environment:
+      - PORT=5555
+      - GUNICORN_WORKERS=2
+      - GUNICORN_THREADS=4
+      - GUNICORN_TIMEOUT=360
+      - GUNICORN_KEEP_ALIVE=5
+
+  yapfiles-downloader:
+    build: ./yapfiles-downloader
+    image: 192.168.8.174:3000/vrubel/video-yapfiles:latest
+    container_name: yapfiles_downloader_service
+    restart: unless-stopped
+    network_mode: host
+    volumes:
+      - ./yapfiles-downloader/downloads:/app/downloads
+    environment:
+      - PORT=5558
+
+  tiktok-downloader:
+    build: ./tiktok-downloader
+    image: 192.168.8.174:3000/vrubel/video-tiktok:latest
+    container_name: tiktok_downloader_service
+    restart: unless-stopped
+    network_mode: host
+    volumes:
+      - ./tiktok-downloader/downloads:/app/downloads
+    environment:
+      - PORT=5559