Add build and deploy workflow

Author: JimMadge

.github/workflows/docs.yaml

@@ -0,0 +1,44 @@
+name: Build and deploy docs
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build docs
+        working-directory: ./docs
+        run: mkdocs build
+      - name: Setup Pages
+        if: github.event_name != 'pull_request'
+        uses: actions/configure-pages@v5
+      - name: Upload artifact
+        if: github.event_name != 'pull_request'
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./docs/site/
+      - name: Deploy to GitHub Pages
+        if: github.event_name != 'pull_request'
+        id: deployment
+        uses: actions/deploy-pages@v4

docs/docs/deploy_infrastructure.md

@@ -0,0 +1 @@
+# Deploy Infrastructure

docs/mkdocs.yml

@@ -2,6 +2,7 @@
 site_name: FRIDGE
 repo_url: https://github.com/alan-turing-institute/fridge
 edit_uri: blob/main/docs/docs/
+site_url: https://alan-turing-institute.github.io/fridge
 copyright: >-
   © The contributors.