Simplify Quick Start: single docker compose up

- Dockerfile: auto-generate DUMPSTER_SECRET if not set
- compose.yml: remove env_file requirement, use env vars with defaults, share web_assets volume with caddy
- README: Quick Start is now 3 commands (clone, cd, docker compose up)

docker/Dockerfile

@@ -19,4 +19,4 @@ WORKDIR /app
 COPY --from=go-builder /bin/dumpster-server /app/dumpster-server
 COPY --from=web-builder /app/dist /srv/web
 EXPOSE 8080
-CMD ["/app/dumpster-server"]
+CMD ["sh", "-c", "if [ -z \"$DUMPSTER_SECRET\" ]; then export DUMPSTER_SECRET=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 32); fi; /app/dumpster-server"]

docker/compose.yml

@@ -6,15 +6,26 @@ services:
       context: ..
       dockerfile: docker/Dockerfile
     container_name: dumpster-app
-    env_file:
-      - ../.env
     environment:
+      DUMPSTER_HOST: ${DUMPSTER_HOST:-localhost}
+      DUMPSTER_PORT: "8080"
+      DUMPSTER_SECRET: ${DUMPSTER_SECRET:-}
       POSTGRES_HOST: postgres
-      POSTGRES_PORT: 5432
+      POSTGRES_PORT: "5432"
+      POSTGRES_USER: ${POSTGRES_USER:-dumpster}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-dumpster}
+      POSTGRES_DB: ${POSTGRES_DB:-dumpster}
       VALKEY_URL: redis://valkey:6379
-      MINIO_ENDPOINT: minio:9000
+      MINIO_ENDPOINT: ${MINIO_ENDPOINT:-}
+      MINIO_ACCESS_KEY: ${MINIO_ACCESS_KEY:-}
+      MINIO_SECRET_KEY: ${MINIO_SECRET_KEY:-}
+      LIVEKIT_API_KEY: ${LIVEKIT_API_KEY:-devkey}
+      LIVEKIT_API_SECRET: ${LIVEKIT_API_SECRET:-secret}
+      GIPHY_API_KEY: ${GIPHY_API_KEY:-}
     ports:
       - "8080:8080"
+    volumes:
+      - web_assets:/srv/web
     depends_on:
       postgres:
         condition: service_healthy
@@ -30,8 +41,6 @@ services:
       POSTGRES_DB: ${POSTGRES_DB:-dumpster}
     volumes:
       - postgres_data:/var/lib/postgresql/data
-    ports:
-      - "5432:5432"
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-dumpster} -d ${POSTGRES_DB:-dumpster}"]
       interval: 5s
@@ -43,8 +52,6 @@ services:
     container_name: dumpster-valkey
     volumes:
       - valkey_data:/data
-    ports:
-      - "6379:6379"
     healthcheck:
       test: ["CMD", "valkey-cli", "ping"]
       interval: 5s
@@ -60,9 +67,6 @@ services:
       MINIO_ROOT_PASSWORD: ${MINIO_SECRET_KEY:-dumpster-secret}
     volumes:
       - minio_data:/data
-    ports:
-      - "9000:9000"
-      - "9001:9001"
 
   livekit:
     image: livekit/livekit-server:latest
@@ -103,6 +107,7 @@ services:
       - "443:443"
     volumes:
       - ./Caddyfile:/etc/caddy/Caddyfile:ro
+      - web_assets:/srv/web:ro
       - caddy_data:/data
       - caddy_config:/config
     depends_on:
@@ -112,5 +117,6 @@ volumes:
   postgres_data:
   valkey_data:
   minio_data:
+  web_assets:
   caddy_data:
   caddy_config: