example compose and env docs

docker-compose.example.yml

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+name: cruciverb
+
+# copy this to docker-compose.yml (or point compose at it with -f) and
+# copy .env.example to .env before starting
+
+services:
+  app:
+    image: git.lashman.live/lashman/cruciverb:latest
+    container_name: cruciverb
+    restart: unless-stopped
+    security_opt:
+      - no-new-privileges:true
+    deploy:
+      resources:
+        limits:
+          memory: 512M
+          cpus: '2.0'
+    healthcheck:
+      test: ["CMD-SHELL", "curl -sf http://localhost:8080/health || exit 1"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 30s
+    ports:
+      - "${PORT:-8484}:8080"
+    volumes:
+      - ./data:/app/data
+    environment:
+      PORT: 8080
+      DATA_DIR: /app/data
+      STATIC_DIR: /app/static
+      RUST_LOG: info
+
+      # where your instance lives
+      INSTANCE_URL: ${INSTANCE_URL:-http://localhost:8484}
+      CORS_ORIGIN: ${CORS_ORIGIN:-http://localhost:8484}
+
+      # webauthn / passkeys
+      RP_ID: ${RP_ID:-localhost}
+      RP_ORIGIN: ${RP_ORIGIN:-http://localhost:8484}
+
+      # activitypub federation
+      AP_DOMAIN: ${AP_DOMAIN:-localhost}
+      AP_ACTOR_NAME: ${AP_ACTOR_NAME:-cruciverb}
+
+      # admin - leave empty, use first-run setup via browser instead
+      ADMIN_PATH: /admin
+
+      # set to true when nginx/caddy sits in front and sets x-forwarded-for
+      TRUST_PROXY: ${TRUST_PROXY:-false}
+
+      # at-rest encryption for user data - generate yours with
+      #   openssl rand -hex 32
+      DATA_ENC_KEY: ${DATA_ENC_KEY:-}