Add nix build action

.forgejo/workflows/build.yaml

@@ -0,0 +1,13 @@
+name: Verilator Unit Tests
+on: [push]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: Build site
+        run: nix build

.github/workflows/gh-pages.yml.sample

@@ -1,48 +0,0 @@
-# If you’d like to deploy this to GitHub pages, rename this
-# file to `gh-pages.yml` and read the mini-tutorial on
-# https://www.11ty.dev/docs/deployment/#deploy-an-eleventy-project-to-github-pages
-name: Deploy to GitHub Pages
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-
-jobs:
-  deploy:
-    runs-on: ubuntu-22.04
-    permissions:
-      contents: write
-    concurrency:
-      group: ${{ github.workflow }}-${{ github.ref }}
-    steps:
-      - uses: actions/checkout@v3
-
-      - name: Setup Node
-        uses: actions/setup-node@v3
-        with:
-          node-version: '18'
-
-      - name: Cache npm
-        uses: actions/cache@v3
-        with:
-          path: ~/.npm
-          key: ${{ runner.os }}-node-${{ hashFiles('**/package.json') }}
-
-      - name: Cache Eleventy .cache
-        uses: actions/cache@v3
-        with:
-          path: ./.cache
-          key: ${{ runner.os }}-eleventy-fetch-cache
-
-
-      - run: npm install
-      - run: npm run build-ghpages
-
-      - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
-        if: github.ref == 'refs/heads/main'
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./_site