Fix path for link checking in build-test.yaml

Author: zastrowm

.github/workflows/build-test.yaml

@@ -43,4 +43,4 @@ jobs:
         id: lychee
         uses: lycheeverse/lychee-action@v2
         with:
-          args: ' --cache --max-cache-age 1d "~/**/*.md"'
+          args: "--cache --max-cache-age 1d 'docs/**/*.md'"