Подготовить skeleton лабораторной 6 по мессенджеру

.env.example

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+# Copy to .env for your LOCAL synthetic test environment; never commit .env.
+# These are logical interface suggestions; map actual framework names in REPORT.md.
+APP_HOST=0.0.0.0
+APP_PORT=8080
+APP_ENV=lab
+SESSION_TTL_SECONDS=3600
+# Choose credentials locally. File paths contain no secret values.
+DATABASE_URL_FILE=/run/secrets/database_url
+# Optional on 3, required use on 4 in lab2; Redis OR Valkey:
+SESSION_STORE=postgres
+CACHE_URL_FILE=/run/secrets/cache_url
+API_REPLICAS=2
+IDEMPOTENCY_TTL_SECONDS=86400
+S3_ENDPOINT=http://s3:9000
+S3_REGION=us-east-1
+S3_BUCKET=messenger-attachments
+S3_ACCESS_KEY_ID_FILE=/run/secrets/s3_access_key_id
+S3_SECRET_ACCESS_KEY_FILE=/run/secrets/s3_secret_access_key
+MAX_UPLOAD_BYTES=10485760
+MAX_IMAGE_PIXELS=40000000
+BROKER_URL_FILE=/run/secrets/broker_url
+WORKER_CONCURRENCY=2
+JOB_MAX_ATTEMPTS=5
+JOB_TIMEOUT_SECONDS=60
+STAGING_RETENTION_SECONDS=86400
+OTEL_SERVICE_NAME=messenger-api
+# Worker must set a distinct service.name.
+OTEL_EXPORTER_OTLP_ENDPOINT=http://otel-collector:4318
+OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
+OTEL_RESOURCE_ATTRIBUTES=deployment.environment.name=lab