Change auto deployment to use GitHub actions

.github/workflows/ci.yml

@@ -3,9 +3,10 @@ name: CI
 on:
   push:
   pull_request:
+  workflow_dispatch:
 
 jobs:
-  Acceptance:
+  Deploy:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
@@ -20,3 +21,7 @@ jobs:
       - run: make
       - run: make served
       - run: make test
+      - run: git config --global user.name "GitHub Actions" && git config --global user.email "actions@github.com"
+      - run: git config --global url."https://${{ github.actor }}:${{ secrets.GITHUB_TOKEN }}@github.com/".insteadOf "https://github.com/"
+      - run: make deploy
+        if: ${{ github.ref == 'refs/heads/main' && github.event_name != 'pull_request' }}

Makefile

@@ -24,7 +24,15 @@ test:
 	bash tests/acceptance.sh
 	test -z "$$(git status --porcelain)" || (echo Directory is dirty && git status && exit 1)
 
+deploy:
+	git -C build/ init
+	git -C build/ checkout live 2>/dev/null || git -C build/ checkout -b live
+	git -C build/ add --all
+	git -C build/ diff-index HEAD >/dev/null 2>/dev/null || git -C build/ commit -m "Website build"
+	git -C build/ remote get-url origin >/dev/null 2>/dev/null || git -C build/ remote add origin $(shell git remote get-url origin)
+	git -C build/ push origin live -f
+
 clean:
 	rm -rf build/ vendor/ tailwindcss
 
-.PHONY: build serve served test clean
+.PHONY: build serve served test deploy clean

README.md

@@ -1,5 +1,8 @@
 # clue.engineering
 
+[![CI status](https://github.com/clue/clue.engineering/actions/workflows/ci.yml/badge.svg)](https://github.com/clue/clue.engineering/actions)
+[![Last deployed on `live`](https://img.shields.io/github/last-commit/clue/clue.engineering/live?label=last%20deployed&logo=github)](https://github.com/clue/clue.engineering/tree/live)
+
 Source code for the https://clue.engineering/ website.
 
 ## Build
@@ -53,3 +56,16 @@ Additionally, this should be deployed behind a reverse proxy (nginx) that is
 responsible for HTTPS certificate handling and forcing HTTPS redirects.
 
 Additionally, Apache has been configured to cache static files for 1 day.
+
+The live website is deployed by pushing the contents of the `build/` directory to
+the `live` branch like this:
+
+```bash
+make deploy
+```
+
+## Auto-Deployment
+
+Any time a commit is merged (such as when a PR is merged), GitHub actions will
+automatically build and deploy the website. This is done by running the above
+deployment script (see previous chapter).