CI: Add svelte job

Author: Turbo87

.github/workflows/ci.yml

@@ -82,11 +82,17 @@ jobs:
         with:
           files: .github/workflows/**
 
+      - uses: tj-actions/changed-files@24d32ffd492484c1d75e0c0b894501ddb9d30d62 # v47.0.0
+        id: changed-files-svelte
+        with:
+          files: svelte/**
+
     outputs:
       non-js: ${{ steps.changed-files-non-js.outputs.any_modified }}
       non-rust: ${{ steps.changed-files-non-rust.outputs.any_modified }}
       rust-lockfile: ${{ steps.changed-files-rust-lockfile.outputs.any_modified }}
       ci: ${{ steps.changed-files-ci.outputs.any_modified }}
+      svelte: ${{ steps.changed-files-svelte.outputs.any_modified }}
 
   percy-nonce:
     name: Frontend / Percy Nonce
@@ -362,3 +368,34 @@ jobs:
         with:
           sarif_file: results.sarif
           category: zizmor
+
+  svelte:
+    name: Svelte (experimental)
+    runs-on: ubuntu-24.04
+    needs: changed-files
+    if: needs.changed-files.outputs.svelte == 'true'
+
+    defaults:
+      run:
+        working-directory: svelte
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          persist-credentials: false
+
+      - uses: pnpm/action-setup@41ff72655975bd51cab0327fa583b6e92b6d3061 # v4.2.0
+        with:
+          version: ${{ env.PNPM_VERSION }}
+
+      - uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6.1.0
+        with:
+          cache: pnpm
+          node-version-file: package.json
+
+      - run: pnpm install
+
+      - run: pnpm lint
+      - run: pnpm check
+      - run: pnpm build
+      - run: pnpm test