chore(github): print uncommitted files for browserstack (stenciljs#3531)

this commit updates the "Git status check" step
of the browserstack workflow to print the names
of the files that are uncommitted

Author: rwaskiewicz

.github/workflows/test-browserstack.yml

@@ -101,5 +101,5 @@ jobs:
         # here we check that there are no changed / new files from our test
         # run. we use `git status`, grep out the build zip (downloaded above),
         # and check if there are more than 0 lines in the output.
-        run: if [[ $(git status --short | grep -c -v stencil-core-build.zip) -ne 0 ]]; then exit 1; fi
+        run: if [[ $(git status --short | grep -c -v stencil-core-build.zip) -ne 0 ]]; then echo git status --short; exit 1; fi
         shell: bash