[mod] use FORD6 on GitHub Actions to deploy docs.

.github/workflows/ford6.yml

@@ -0,0 +1,50 @@
+name: FORD6
+
+on:
+   push:
+      branches: [ "main" ]
+   pull_request:
+      branches: [ "main" ]
+
+jobs:
+   documentation:
+      runs-on: ${{ matrix.os }}
+      permissions:
+         contents: write
+      strategy:
+         fail-fast: false
+         matrix:
+            os: [ubuntu-latest]
+            python-version: [3.12]
+
+      steps:
+      - name: Checkout Code
+        uses: actions/checkout@v3
+        with:
+           submodules: recursive
+
+      - name: Install Python
+        uses: actions/setup-python@v4
+        with:
+           python-version: ${{ matrix.python-version}}
+
+      - name: Setup Graphviz
+        uses: ts-graphviz/setup-graphviz@v1
+
+      - name: Install FORD6
+        if: contains ( matrix.os, 'ubuntu')
+        run: |
+         python -m pip install --upgrade pip
+         pip install 'FORD==6.2.5'
+         if [ -f requirements.txt ]; then pip install -r requirement.txt; fi
+
+      - name: Build FORD Documentation
+        run: ford ./gen-ford.yml
+
+      - name: Deploy Documentation
+        uses: JamesIves/github-pages-deploy-action@v4.4.3
+        with:
+          branch: gh-pages
+          folder: doc
+
+

gen-ford.yml

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+src_dir: ./src
+output_dir: ./doc
+page_dir: ./doc-src/pages
+project: Libpq-Fortran
+summary: Access PostgreSQL via Modern Fortran.
+author: Amasaki Shinobu
+author_pic: https://shinobuamasaki.github.io/img/shinobu.png
+github: https://github.com/ShinobuAmasaki
+twitter: https://twitter.com/amasaki203
+website: https://shinobuamasaki.github.io
+favicon: doc-src/ford/favicon.ico
+css: doc-src/ford/common.css
+graph: false
+license: MIT
+
+{!doc-src/readme.md!}