lint.yml: python 3.10

lint.yml: python 3.9

move haikuporter repo update before Lint job (#7943)

lint updated recipes as well, and move script (#7926)

* also lint changed recipes

example commit taken from a recent PR:

$ git diff HEAD HEAD~ --numstat
7 7 media-sound/freac/{freac-1.1.7.recipe => freac-1.1.6.recipe}

-> lint-new-recipes.sh tries to find `media-sound/freac/{freac-1.1.7.recipe` which does not exist

$ git diff --no-renames HEAD HEAD~ --numstat
98 0 media-sound/freac/freac-1.1.6.recipe
0 98 media-sound/freac/freac-1.1.7.recipe

-> lint-new-recipes.sh skips over 1.1.6 (because it is gone) and lints 1.1.7

* move lint-new-recipes.sh into .github/

.github/lint: Fix export syntax.

.github/lint: Set PATH in the proper location.

.github/lint: Remove unnecessary cd.

.github/lint: export PATH.

.github/lint: Use proper multi-line syntax.

.github/lint: Adjustments.

Create lint.yml action file.

This will replace Travis-CI.