Create jekyll-docker.yml

[PavinStrickland]

name: Jekyll site CI

on:
push:
branches: [ "master" ]
pull_request:
branches: [ "master" ]

jobs:
build:

runs-on: ubuntu-latest

steps:
- uses: actions/checkout@v4
- name: Build the site in the jekyll/builder container
  run: |
    docker run \
    -v ${{ github.workspace }}:/srv/jekyll -v ${{ github.workspace }}/_site:/srv/jekyll/_site \
    jekyll/builder:latest /bin/bash -c "chmod -R 777 /srv/jekyll && jekyll build --future"