wk1: initial docker image setup

docker-compose.yml

@@ -0,0 +1,16 @@
+services:
+  jupiter:
+    image: jupiter-mail/jupiter:latest
+    build: .
+    container_name: jupiter-mailserver
+    env_file: mailserver.env
+    ports:
+      - "25:25"   # SMTP
+      - "143:143" # IMAP
+      - "465:465" # SMTP (TLS/STARTTLS)
+      - "993:993" # IMAP (SSL)
+    volumes:
+      - ./jupiter/mail-data/:/var/mail/
+      - ./jupiter/mail-logs/:/var/log/mail/
+      - ./jupiter/config/:/tmp/jupiter-mail/
+    restart: always