GH Actions: replace Jekyll build with MKDocs

.github/workflows/build.yml

@@ -1,40 +1,38 @@
-name: Deploy Site
-
+name: Deploy site
 on: [push]
-
 jobs:
-  build-website:
-    name: Website build
+  deploy:
+    name: Linux Ubuntu 22.04
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
-      - name: Install node
-        uses: actions/setup-node@v2
+        uses: actions/checkout@v3
         with:
-          node-version: '14'
-          cache: 'yarn'
-      - name: Install ruby
-        uses: ruby/setup-ruby@v1
+          fetch-depth: 0 # needed for accurate dates and blog plugin
+      - name: Install Python
+        uses: actions/setup-python@v4
         with:
-          ruby-version: 2.7
-          bundler-cache: true
-      - name: Generate assets
-        run: yarn --no-bin-links && yarn dist
-      - name: Build fork
-        if: ${{ github.repository_owner != 'sfztools' }}
-        run: |
-          bundle exec jekyll build \
-            --destination public/  \
-            --baseurl "/$(echo '${{ github.repository }}' | cut -d/ -f2)"
-      - name: Build sfztools
-        if: ${{ github.repository_owner == 'sfztools' }}
-        run: bundle exec jekyll build --destination public/
+          python-version: 3.x
+      - name: Install Poetry
+        run: python3 -m pip install --upgrade poetry
+      - name: Cache build data
+        uses: actions/cache@v3
+        with:
+          key: mkdocs-cache-${{ runner.os }}-${{ hashFiles('**/poetry.lock', '**/mkdocs.yml') }}
+          path: .cache
+      - name: Install dependencies
+        run: poetry install
+      - name: Download assets
+        run: poetry run python3 scripts/assets/download.py
+      - name: Build assets
+        run: poetry run python3 scripts/assets/uglify.py
+      - name: Build site
+        run: poetry run mkdocs build
       - name: Upload to GitHub pages
-        if: ${{ github.ref_name == 'master' && github.event_name != 'pull_request' }}
+        if: github.ref_name == 'master' && github.event_name != 'pull_request'
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_branch: www
-          publish_dir: ./public
+          publish_dir: ./_site
           force_orphan: true