Add docker-compose service.

docker/README

+Docker compose for ingestion services
+
+To use this docker-compose, you need to put the required sources in
+/home/devops for the discord and github teams.
+
+For the telegram and reddit teams, you can place their environment
+(.env) files in this directory.
+
+Then, just run `docker-compose up`.
+
+Note that the systemd ingestion services in this repository should
+also be running.
\ No newline at end of file

docker/docker-compose.yml

+services:
+  telegram:
+    image: "telegramdibucuu/teledatastream:latest"
+    volumes:
+      - /var/ingestion/telegram:/app/data/output/telegram
+      - ./telegram.session:/app/session_name.session
+    env_file: telegram.env
+  reddit:
+    image: "userhub0/reddit_datafetcher"
+    volumes:
+      - /var/ingestion/reddit:/app/output
+    environment:
+      - SUBREDDITS=electricvehicles,TeslaLounge,BYD,iphone,ios26bugs
+      - POST_LIMIT=100
+      - COMMENT_LIMIT=100
+  discord:
+    build: /home/devops/discord-team-source
+    volumes:
+      - /var/ingestion/discord:/app/ingest
+    env_file: discord.env
+  github:
+    build: /home/devops/github-team-source
+    volumes:
+      - /var/ingestion/github:/app/output