Adding matrix dendrite

dendrite/.env-example

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+BASE_DATA_DIR=$HOME/docker_data
+POSTGRES_PASSWORD=
+POSTGRES_DB=
+POSTGRES_USER=
+POSTGRES_HOST=
+

dendrite/docker-compose.yml

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+version: "3.4"
+
+services:
+  postgres:
+    hostname: postgres
+    image: postgres:15-alpine
+    restart: always
+    volumes:
+      # This will create a docker volume to persist the database files in.
+      # If you prefer those files to be outside of docker, you'll need to change this.
+      - ${BASE_DATA_DIR}/dendrite/postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_DATABASE: dendrite
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U dendrite"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    networks:
+      - internal
+
+  monolith:
+    hostname: monolith
+    image: matrixdotorg/dendrite-monolith:latest
+    ports:
+      - 8008:8008
+      - 8448:8448
+    volumes:
+      - ${BASE_DATA_DIR}/dendrite/config:/etc/dendrite
+      - ${BASE_DATA_DIR}/dendrite/media:/var/dendrite/media
+      - ${BASE_DATA_DIR}/dendrite/jetstream:/var/dendrite/jetstream
+      - ${BASE_DATA_DIR}/dendrite/search-index:/var/dendrite/searchindex
+    depends_on:
+      postgres:
+        condition: service_healthy
+    networks:
+      - internal
+    restart: unless-stopped
+
+networks:
+  internal:
+    attachable: true
+