add github action to deploy to pages

.github/workflows/build.yml

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+name: Build and Deploy to Github Pages
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    branches:
+      - master
+
+jobs:
+  build_only:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # The checkout action doesn't provide a way to get all commit history for a single branch
+          # So we use the magic number 2147483647 here which means infinite depth for git fetch
+          # See https://github.com/actions/checkout/issues/520, https://stackoverflow.com/a/6802238
+          # this is so that last-modified-at plugin can use the git history to determine the last modified date
+          fetch-depth: 2147483647
+      # Use GitHub Actions' cache to cache dependencies on servers
+      - uses: actions/cache@v4
+        with:
+          path: |
+            .asdf/**
+            vendor/bundle
+          key: ${{ runner.os }}-cache-${{ hashFiles('**/cache.key') }}
+          restore-keys: |
+            ${{ runner.os }}-cache-
+      - name: Build
+        uses: actions/jekyll-build-pages@v1
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: adsabs.github.io_site

.github/workflows/deploy.yml

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+name: Build and Deploy to Github Pages
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build_and_deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # The checkout action doesn't provide a way to get all commit history for a single branch
+          # So we use the magic number 2147483647 here which means infinite depth for git fetch
+          # See https://github.com/actions/checkout/issues/520, https://stackoverflow.com/a/6802238
+          # this is so that last-modified-at plugin can use the git history to determine the last modified date
+          fetch-depth: 2147483647
+
+      # Use GitHub Actions' cache to cache dependencies on servers
+      - uses: actions/cache@v4
+        with:
+          path: |
+            .asdf/**
+            vendor/bundle
+          key: ${{ runner.os }}-cache-${{ hashFiles('**/cache.key') }}
+          restore-keys: |
+            ${{ runner.os }}-cache-
+
+      # Use GitHub Deploy Action to build and deploy to Github
+      - uses: jeffreytse/jekyll-deploy-action@v0.6.0
+        with:
+          provider: 'github'
+          token: ${{ secrets.GITHUB_TOKEN }}
+          branch: 'gh-pages'
+          jekyll_src: './'
+          jekyll_cfg: '_config.yml'