only use free runners for examples

[mattseddon]

Checking whether or not we can drop ubuntu-latest-4-cores usage after #409

[cloudflare-workers-and-pages]

Deploying datachain-documentation with    Cloudflare Pages

Latest commit:	5c16bb1
Status:	✅  Deploy successful!
Preview URL:	https://4bd9e9fb.datachain-documentation.pages.dev
Branch Preview URL:	https://use-free-runners.datachain-documentation.pages.dev

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.80%. Comparing base (f3b4fd3) to head (5c16bb1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #469   +/-   ##
=======================================
  Coverage   86.80%   86.80%           
=======================================
  Files          93       93           
  Lines        9800     9800           
  Branches     2027     2027           
=======================================
  Hits         8507     8507           
  Misses        936      936           
  Partials      357      357           

Flag	Coverage Δ
datachain	86.74% <ø> (ø)

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[mattseddon]

still runs out of space