Additional environment variables needed in Staging

The feature create-group-roles and assign-groups requires the following custom variables:

• Discord base URL of Cloudflare for Athena bot: For making requests, we need the base URL of our Discord bot hosted in Cloudflare workers.
  Variable name: DISCORD_BASE_URL
  Location: website-backend

• RSA rdsServerlessPrivateKey: For making requests to the discord-bot server, every request must be authenticated with the same key pair that is used to verify in the discord server. Thus, a new key pair with the name RDS_SERVERLESS is necessary for creating new tokens.
  Variable names:

• RDS_SERVERLESS_PRIVATE_KEY for Website backend

• RDS_SERVERLESS_PUBLIC_KEY for Cloudflare workers Discord-slash commands

• rdsServerlessTtl: For expiry of the generated token.
  Variable name: RDS_SERVERLESS_TTL
  Location: website-backend

Specifications of the key:

• Must be of size 2048.
• Must start with -----BEGIN RSA PRIVATE KEY-----
  This requirement is because the package @tsndr/cloudflare-worker-jwt package used in the discord-slash-command project has this set of requirements to function.

Updates

• A RSA key is to be generated and its private key named RDS_SERVERLESS_PRIVATE_KEY is to be set as an environment variable for website-backend.
• Its corresponding public key, ' RDS_SERVERLESS_PUBLIC_KEY, is to be set as an environment variable for discord-slash-commands` Cloudflare workers.