Update pr-preview.yml

Author: neveler

.github/workflows/pr-preview.yml

@@ -152,8 +152,9 @@ jobs:
           script: |
             const { owner, repo } = context.repo;
             const pages = (await octokit.rest.repos.getPages({ owner, repo })).data;
-            core.setOutput('domain', pages.cname || `${owner.toLowerCase()}.github.io`);
-            core.setOutput('pathname', (pages.cname == null && repo.toLowerCase() !== `${owner.toLowerCase()}.github.io` ) ? `/${repo}` : '');
+            const domain = pages.cname || `${owner.toLowerCase()}.github.io`;
+            core.setOutput('domain', domain);
+            core.setOutput('pathname', (pages.cname || repo.toLowerCase() === domain) ? '' : `/${repo}`);
             const pr = context.payload.pull_request || (await github.rest.pulls.get({
               owner, repo,
               pull_number: context.issue.number