fix: deploy PR dashboard to preview path, use relative base

PR deploys to pr-{number}/{sha}/coverage-matrix/ alongside docs
preview. Main deploys to /coverage-matrix/ from publish.yml.

Changed Vite base to ./ so the same build works at any URL depth.

Author: ryanbas21

.github/workflows/ci.yml

@@ -189,13 +189,13 @@ jobs:
 
             ${{ steps.coverage-matrix-summary.outputs.table }}
 
-            [Full dashboard](https://forgerock.github.io/ping-javascript-sdk/coverage-matrix/)
+            [Full dashboard](https://forgerock.github.io/ping-javascript-sdk/coverage-matrix/) · [PR preview](https://ForgeRock.github.io/ping-javascript-sdk/pr-${{ github.event.number }}/${{ github.sha }}/coverage-matrix/)
 
-      - name: Deploy coverage dashboard to GitHub Pages
+      - name: Preview coverage dashboard
         continue-on-error: true
         uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./tools/coverage-matrix/dist
-          destination_dir: coverage-matrix
+          destination_dir: pr-${{ github.event.number }}/${{ github.sha }}/coverage-matrix
           keep_files: true

tools/coverage-matrix/vite.config.ts

@@ -3,7 +3,7 @@ import { svelte } from '@sveltejs/vite-plugin-svelte';
 
 export default defineConfig({
   root: __dirname,
-  base: '/ping-javascript-sdk/coverage-matrix/',
+  base: './',
   plugins: [svelte()],
   build: {
     outDir: './dist',