Initial commit: Matrix deployment (Synapse, Element, Caddy, Postgres)

Docker-Compose-Setup mit Synapse, Element Web, Synapse-Admin,
Caddy als Reverse Proxy und Postgres. Secrets und Laufzeitdaten
sind via .gitignore ausgeschlossen; Beispiel-Configs mit
Platzhaltern liegen als *.example bei.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y31cBx4B4b56LmzTA9wx76

docker-compose.yml

@@ -0,0 +1,54 @@
+services:
+  db:
+    image: postgres:15
+    restart: unless-stopped
+    environment:
+      - POSTGRES_USER=matrix
+      - POSTGRES_DB=synapse
+      - POSTGRES_PASSWORD_FILE=/run/secrets/db_password
+      - POSTGRES_INITDB_ARGS=--lc-collate=C --lc-ctype=C --encoding=UTF-8
+    secrets:
+      - db_password
+    volumes:
+      - ./postgres:/var/lib/postgresql/data
+
+  synapse:
+    image: matrixdotorg/synapse:latest
+    restart: unless-stopped
+    environment:
+      - SYNAPSE_SERVER_NAME=matrix.greif.life-maps.com
+      - SYNAPSE_REPORT_STATS=no
+    volumes:
+      - ./synapse:/data
+    depends_on:
+      - db
+
+  element:
+    image: vectorim/element-web:latest
+    restart: unless-stopped
+    volumes:
+      - ./element/config.json:/app/config.json:ro
+
+  element-admin:
+    image: awesometechnologies/synapse-admin:latest
+    restart: unless-stopped
+
+  caddy:
+    image: caddy:2-alpine
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./caddy/Caddyfile:/etc/caddy/Caddyfile:ro
+      - ./caddy/data:/data
+      - ./caddy/config:/config
+      - ./matrix-landing:/var/www/html:ro
+    depends_on:
+      - synapse
+      - element
+      - element-admin
+
+secrets:
+  db_password:
+    file: ./secrets/db_password.txt