add github pages pipeline

.github/workflows/build.yml

@@ -1,6 +1,10 @@
 name: Build
 
-on: [pull_request, push]
+on:
+  pull_request:
+  push:
+    branches-ignore:
+      - gh-pages
 
 jobs: 
   build:
@@ -19,5 +23,5 @@ jobs:
       - name: Upload UF2
         uses: actions/upload-artifact@v2
         with:
-          name: watch.uf2.uf2
+          name: watch.uf2
           path: apps/**/build/watch.uf2

.github/workflows/gh-pages.yml

@@ -0,0 +1,22 @@
+name: GitHub Pages
+
+#on:
+#  push:
+#    branches:
+#      - main
+on: [pull_request, push]
+
+jobs:
+  gh-pages:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Doxygen Action
+        uses: mattnotmitt/doxygen-action@v1
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_branch: gh-pages
+          publish_dir: docs/