feat: default service-key for single tenant

[fenos]

What kind of change does this PR introduce?

Feature

What is the current behavior?

Currently, the TENANT_ID, SERVICE_KEY, REGION and ANON_KEY env variables are required to run storage in single-tenant mode

What is the new behavior?

• the SERVICE_KEY env is now optional.
  When not provided, the service will generate one at boot time using the AUTH_JWT_SECRET

• SERVER_REGION is now optional, and only used in metrics. (default not-specified)
  STORAGE_S3_REGION is used as the aws region (default REGION)

• the TENANT_ID env is now optional defaulting to storage-single-tenant

• ANON_KEY is now deprecated as the service is not currently using it

Additional context

This PR will simplify even further self-hosting for storage

Example Docker Compose to launch storage in single tenant:

# docker-compose.yml

version: '3'
services:
  storage:
    image: supabase/storage-api:latest
    ports:
      - '5000:5000'
      - '5001:5001'
    depends_on:
      - tenant_db
      - pg_bouncer
      - minio
    environment:
      # Server
      SERVER_PORT: 5000
      # Auth
      AUTH_JWT_SECRET: f023d3db-39dc-4ac9-87b2-b2be72e9162b
      AUTH_JWT_ALGORITHM: HS256
      # Single tenant Mode
      DATABASE_URL: postgres://postgres:postgres@tenant_db:5432/postgres
      DATABASE_POOL_URL: postgresql://postgres:postgres@pg_bouncer:6432/postgres
      # Migrations
      DB_INSTALL_ROLES: true # set to false if you want to manage roles yourself
      # Storage
      STORAGE_BACKEND: s3
      STORAGE_S3_BUCKET: supa-storage-bucket  # name of s3 bucket where you want to store objects
      STORAGE_S3_ENDPOINT: http://minio:9000
      STORAGE_S3_FORCE_PATH_STYLE: "true"
      STORAGE_S3_REGION: us-east-1
      AWS_ACCESS_KEY_ID: supa-storage
      AWS_SECRET_ACCESS_KEY: secret1234
      # Upload
      UPLOAD_FILE_SIZE_LIMIT: 524288000
      UPLOAD_FILE_SIZE_LIMIT_STANDARD: 52428800
      UPLOAD_SIGNED_URL_EXPIRATION_TIME: 120
      TUS_URL_PATH: /upload/resumable
      TUS_URL_EXPIRY_MS: 3600000
      # Image Tranformation
      IMAGE_TRANSFORMATION_ENABLED: "true"
      IMGPROXY_URL: http://imgproxy:8080
      IMGPROXY_REQUEST_TIMEOUT: 15

[coveralls]

Pull Request Test Coverage Report for Build 7531817335

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.07%) to 82.915%

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Totals
Change from base Build 7530203780:	-0.07%
Covered Lines:	7824
Relevant Lines:	9335

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💛 - Coveralls

[github-actions]

🎉 This PR is included in version 0.45.0 🎉

The release is available on GitHub release

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