Install inline gemfile to a separate path

Not sure how to cache that, but at least this way it doesn't mess up the
other cache.

Author: deivid-rodriguez

.github/workflows/ci.yaml

@@ -64,7 +64,7 @@ jobs:
         run: bin/rake lint
 
       - name: Run bug report template
-        run: ACTIVE_ADMIN_PATH=. ruby tasks/bug_report_template.rb
+        run: BUNDLE_PATH=vendor/inline_bundle ACTIVE_ADMIN_PATH=. ruby tasks/bug_report_template.rb
 
       - name: Format coverage
         run: |