Allocate more memory for link_extension step

[bwoebi]

Root cause of #2865 - using a large instead of a medium circleci instance.

And changing the build step so that it will properly fail now if any command fails.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.40%. Comparing base (f4b4015) to head (61f99d4).

Additional details and impacted files

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[bwoebi]

@morrisonlevi It looks like it just affected a single version on a single target. But yes :-X