feat: port pneumatube to Rust on fumi-core

docker-compose.yml

@@ -7,25 +7,27 @@
 #
 # Requires PNEUMATUBE_SMOLMAIL_DOMAIN and PNEUMATUBE_SMTP_RELAY_HOST set in
 # the environment or a .env file. The gateway's own smolmail account must
-# already be registered against that server before pneumatube can run — the
-# same bootstrap as any smolmail client, using the mounted sibling checkout
-# and ./data as --key/--db:
+# already be registered against that server before pneumatube can run —
+# the same bootstrap as any smolmail client, using the fumi CLI that ships
+# inside the image and ./data as --key/--db:
 #
 #   docker compose run --rm pneumatube \
-#     uv run /smolmail/smolmail.py --key /data/gateway.key --db /data/gateway.db keygen
+#     fumi --key /data/gateway.key --db /data/gateway.db keygen
 #   docker compose run --rm pneumatube \
-#     uv run /smolmail/smolmail.py --key /data/gateway.key --db /data/gateway.db trust <host> <server-key>
+#     fumi --key /data/gateway.key --db /data/gateway.db trust <host> <server-key>
 #   docker compose run --rm pneumatube \
-#     uv run /smolmail/smolmail.py --key /data/gateway.key --db /data/gateway.db register <user>@<host>
+#     fumi --key /data/gateway.key --db /data/gateway.db register <user>@<host>
 
 services:
   pneumatube:
-    build: .
+    # The build context is the parent directory, because Cargo path-depends
+    # on the sibling fumi checkout (../fumi/core) for the smolmail protocol.
+    build:
+      context: ..
+      dockerfile: pneumatube/Dockerfile
     volumes:
-      - ../smolmail:/smolmail:ro
       - ./data:/data
     environment:
-      PNEUMATUBE_SMOLMAIL_REPO: /smolmail
       PNEUMATUBE_SMOLMAIL_KEY: /data/gateway.key
       PNEUMATUBE_SMOLMAIL_DB: /data/gateway.db
       PNEUMATUBE_SMOLMAIL_DOMAIN: ${PNEUMATUBE_SMOLMAIL_DOMAIN:?set the smolmail server address}