[Doxygen] generate Doxygen to gh-pages branch

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

@@ -0,0 +1,19 @@
+name: Doxygen GitHub Pages Deploy Action
+
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: DenverCoder1/[email protected]
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: gh-pages
+          folder: docs/html
+          config_file: Doxyfile
+          doxygen_version: 1.9.6

Doxyfile

@@ -58,7 +58,7 @@ PROJECT_LOGO           =
 # entered, it will be relative to the location where doxygen was started. If
 # left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       =
+OUTPUT_DIRECTORY       =docs
 
 # If the CREATE_SUBDIRS tag is set to YES then doxygen will create 4096 sub-
 # directories (in 2 levels) under the output directory of each output format and