Fix glob pattern for link checking in workflow

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 "~/**/*.md"'