fix docs test on CI

docs/.gitignore

@@ -1,2 +1,2 @@
-*.txt
+after.txt
 .next/

docs/before.txt

@@ -0,0 +1,48 @@
+./whats_new/changelog.md
+./objects/grid.md
+./objects/table-object.md
+./objects/layout.md
+./utilities/marketing-filters.md
+./utilities/marketing-padding.md
+./utilities/marketing-margin.md
+./utilities/marketing-layout.md
+./utilities/details.md
+./utilities/padding.md
+./utilities/flexbox.md
+./utilities/marketing-borders.md
+./utilities/animations.md
+./utilities/box-shadow.md
+./utilities/typography.md
+./utilities/marketing-type.md
+./utilities/margin.md
+./utilities/layout.md
+./utilities/borders.md
+./components/page-headers.md
+./components/markdown.md
+./components/buttons.md
+./components/tables.md
+./components/forms.md
+./components/blankslate.md
+./components/marketing-buttons.md
+./components/popover.md
+./components/pagination.md
+./components/progress.md
+./components/branch-name.md
+./components/navigation.md
+./components/subhead.md
+./components/avatars.md
+./components/tooltips.md
+./components/alerts.md
+./components/box.md
+./components/breadcrumb.md
+./components/labels.md
+./components/truncate.md
+./components/page-sections.md
+./support/marketing-variables.md
+./support/breakpoints.md
+./support/spacing.md
+./support/typography.md
+./packages/primer-core.md
+./packages/primer.md
+./packages/primer-product.md
+./packages/primer-marketing.md

docs/test.sh

@@ -1,10 +1,12 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 cwd=`pwd`
 
-pushd ../../../github/styleguide/src/_primer > /dev/null
-find . -name '*.md' > $cwd/before.txt
-popd > /dev/null
+if [[ ! -e before.txt ]]; then
+    pushd ../../../github/styleguide/src/_primer > /dev/null
+    find . -name '*.md' > $cwd/before.txt
+    popd > /dev/null
+fi
 
 pushd pages/css > /dev/null
 find . -name '*.md' > $cwd/after.txt