docker: fix compose self-hosting and add external Mongo/MinIO/Garage examples (#106)

* docker: update .env and docker-compose.yml for SMTP and new services

* docker: add external MinIO, MongoDB, and GarageHQ examples with setup instructions

* docs: update README with dotenv docker setup instructions and configuration redirect for external services

* docker: update service dependency condition for setup-themes in docker-compose.yml

* chore: update example URLs in .env for public services

examples/external-mongodb/.env.example

@@ -0,0 +1,4 @@
+# Merge these into the repository root .env (see /.env for all other variables).
+
+MONGODB_CONNECTION_STRING_IDENTITY=mongodb://notesnook-mongodb:27017/identity?replSet=rs0
+MONGODB_CONNECTION_STRING=mongodb://notesnook-mongodb:27017/?replSet=rs0

examples/external-mongodb/README.md

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+# External MongoDB
+
+MongoDB runs in a separate compose project. The Notesnook stack uses the root [`docker-compose.yml`](../../docker-compose.yml) with [`notesnook.override.yml`](notesnook.override.yml), which disables the embedded `notesnook-db` service and points at external Mongo. Embedded MinIO is unchanged.
+
+## Setup
+
+From the **repository root**:
+
+```bash
+# Merge into root .env
+cat examples/external-mongodb/.env.example >> .env
+# set NOTESNOOK_API_SECRET and other required root .env values
+
+# 1. MongoDB
+docker compose -f examples/external-mongodb/infra.compose.yml up -d
+
+# 2. Notesnook
+docker compose -f docker-compose.yml -f examples/external-mongodb/notesnook.override.yml up -d
+```
+
+## Environment (delta)
+
+See [`.env.example`](.env.example) — only `MONGODB_CONNECTION_STRING*` overrides are needed beyond the root `.env`.
+
+## Stop
+
+```bash
+docker compose -f docker-compose.yml -f examples/external-mongodb/notesnook.override.yml down
+docker compose -f examples/external-mongodb/infra.compose.yml down
+```
+
+## Notes
+
+- Replica set `rs0` is required; the infra healthcheck initializes it.
+- Host port `27017` is exposed for debugging.
+- If infra stops, `identity-server` and `notesnook-server` fail until MongoDB is back.

examples/external-mongodb/infra.compose.yml

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+name: notesnook-external-mongodb-infra
+
+services:
+  notesnook-mongodb:
+    image: mongo:7.0.12
+    hostname: notesnook-mongodb
+    ports:
+      - 27017:27017
+    volumes:
+      - dbdata:/data/db
+    networks:
+      - notesnook-shared
+    command: --replSet rs0 --bind_ip_all
+    healthcheck:
+      test: echo 'try { rs.status() } catch (err) { rs.initiate() }; db.runCommand("ping").ok' | mongosh mongodb://localhost:27017 --quiet
+      interval: 40s
+      timeout: 30s
+      retries: 3
+      start_period: 60s
+
+networks:
+  notesnook-shared:
+    name: notesnook-shared
+
+volumes:
+  dbdata:

examples/external-mongodb/notesnook.override.yml

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+services:
+  notesnook-db:
+    profiles: [embedded-disabled]
+
+  identity-server:
+    depends_on: !override
+      validate:
+        condition: service_completed_successfully
+    networks:
+      - notesnook
+      - notesnook-shared
+    environment:
+      MONGODB_CONNECTION_STRING: ${MONGODB_CONNECTION_STRING_IDENTITY}
+
+  notesnook-server:
+    networks:
+      - notesnook
+      - notesnook-shared
+    depends_on: !override
+      notesnook-s3:
+        condition: service_started
+      setup-s3:
+        condition: service_started
+      identity-server:
+        condition: service_started
+    environment:
+      MONGODB_CONNECTION_STRING: ${MONGODB_CONNECTION_STRING}
+
+networks:
+  notesnook-shared:
+    external: true