add CURRENT_ENVIRONMENT to github actions

Author: Saitharun279

.github/workflows/register-commands-staging.yaml

@@ -14,6 +14,7 @@ jobs:
       - run: npm install
       - run: npm run env-var-check
         env:
+          CURRENT_ENVIRONMENT: staging
           DISCORD_APPLICATION_ID: ${{secrets.DISCORD_APPLICATION_ID}}
           DISCORD_GUILD_ID: ${{secrets.DISCORD_GUILD_ID}}
           DISCORD_TOKEN: ${{secrets.DISCORD_TOKEN}}