fix(ci): hardcode preview site domain fragment

using the repo name, which is itself a domain name, does not work

Author: thekaveman

.github/workflows/site-preview.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Deploy Preview to Netlify
         run: |
           netlify deploy \
-            --alias="${GITHUB_REPOSITORY#*/}-${{ github.event.number }}" \
+            --alias="compiler-docs-${{ github.event.number }}" \
             --auth=${{ secrets.NETLIFY_AUTH_TOKEN }} \
             --dir="_site" \
             --site=${{ vars.NETLIFY_PREVIEW_APP_SITE_ID }}
@@ -56,5 +56,5 @@ jobs:
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
-              body: `Preview url: https://${context.repo.repo}-${{ github.event.number }}--${hostnameSuffix}`,
+              body: `Preview url: https://compiler-docs-${{ github.event.number }}--${hostnameSuffix}`,
             })