Infection fails when merging

[kenjis]

See codeigniter4/tasks#106

devkit/src/Template/.github/workflows/infection.yml

Lines 70 to 71 in 108086f

	git fetch --depth=1 origin $GITHUB_BASE_REF
	infection --threads=2 --skip-initial-tests --coverage=build/phpunit --git-diff-base=origin/$GITHUB_BASE_REF --git-diff-filter=AM --logger-github --ignore-msi-with-no-mutations

The above code came from https://github.com/codeigniter4/devkit/pull/1/files#diff-743fb74623cea21af8e4a2448eb3899f9ad6bfe9faf90e3a5db6384333102e45R72-R73

It seems it came from:

• https://infection.github.io/guide/command-line-options.html#git-diff-base
• https://infection.github.io/guide/command-line-options.html#logger-github
• https://github.com/infection/infection/blob/bef65fc22faa200edd367ffe12596905947a2a93/.github/workflows/mt-annotations.yaml#L50-L52

[kenjis]

Closed by #94