Deploy to github pages example

[acrogenesis]

I enjoyed creating my website with tableau, it's very straightforward and ai (codex) didn't have any issues at all.
I wanted to contribute with this small deploy script for github actions but wasn't sure where to add it.

https://github.com/acrogenesis/acrogenesis.com/blob/main/.github/workflows/deploy.yml

name: Deploy site to GitHub Pages

on:
  push:
    branches: [main]

permissions:
  contents: read
  pages: write
  id-token: write

concurrency:
  group: pages
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v5

      - name: Set up Erlang/OTP and Elixir
        uses: erlef/setup-beam@v1
        with:
          otp-version: "28"
          elixir-version: "1.18"

      - name: Cache Mix deps
        uses: actions/cache@v4
        with:
          path: |
            ~/.mix
            deps
            _build
          key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            ${{ runner.os }}-mix-

      - name: Install dependencies
        run: MIX_ENV=prod mix deps.get --only prod

      - name: Build site
        run: MIX_ENV=prod mix build

      - name: Upload artifact
        uses: actions/upload-pages-artifact@v4
        with:
          path: _site

  deploy:
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    runs-on: ubuntu-latest
    needs: build
    steps:
      - id: deployment
        uses: actions/deploy-pages@v4

[mhanberg]

We can put it in the docs and maybe the project generator!

I'd make a "guide" for it.

You can see an example of how to configure guides in this repo.

https://github.com/mhanberg/temple/blob/main/mix.exs

[mhanberg]

Also please feel free to add your site to the table in the readme!