Add GitHub Actions workflow for Pelican Pages publishing

Co-authored-by: amitsaha <512598+amitsaha@users.noreply.github.com>

Author: Copilot

.github/workflows/publish.yml

@@ -0,0 +1,59 @@
+name: Publish website
+
+on:
+  push:
+    branches:
+      - master
+      - site
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+
+      - name: Install Pelican and plugins
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install pelican pelican-youtube markdown pelican-gist beautifulsoup4
+          git clone --recursive https://github.com/getpelican/pelican-plugins /pelican-plugins
+
+      - name: Build site
+        run: |
+          make build
+          cp CNAME output/CNAME
+
+      - name: Configure Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: output
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

README.md

@@ -1,9 +1,7 @@
 # Notes for future self
 
+Publishing is handled by GitHub Actions.
 
-1. Edit on site
-2. build using ./build.sh
-3. copy output somewhere
-4. git checkout master
-5. copy the output from somewhere to master
-6. git push
+1. Edit content on the `site` branch
+2. Push changes
+3. GitHub Actions builds the Pelican site and deploys to GitHub Pages