add 'on_demand' service tier required to support the Groq.com provider

[the-gigi]

This fixes issue #344

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.62%. Comparing base (8379464) to head (38c9a97).
⚠️ Report is 12 commits behind head on main.
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #345   +/-   ##
=========================================
  Coverage     94.61%   94.62%           
  Complexity      192      192           
=========================================
  Files            90       90           
  Lines          1821     1822    +1     
  Branches         70       70           
=========================================
+ Hits           1723     1724    +1     
  Misses           63       63           
  Partials         35       35           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.