How a CI pipeline stops broken code before it reaches main

How a CI pipeline stops broken code before it reaches main

One failing test, and the change never reaches main.

Every push is built and run through the tests on its own. Here 9.99 plus tax rounds down to 10.78 instead of 10.79, one test goes red, and the gate stays shut until the fix passes all six.

Send it to someone who just set up their first pipeline.

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