build: add bun

includes many changes needed for this to work

.ci/Makefile

@@ -1,21 +1,21 @@
 .PHONY: *
 
 prebuild:
-	npm run prebuild
+	cd .. && bun run bun:prebuild
 
-build: prebuild
-	npm run prerender
-	npm run postbuild
+build:
+	cd .. && bun run prerender
+	cd .. && bun run postbuild
 
 install:
-  # So @ngaox/seo installs (declares peer dep of Angular 15)
-	npm ci --legacy-peer-deps
+	# https://bun.sh/docs/cli/install#production-mode
+	bun install --frozen-lockfile
 
 lint:
-	npm run lint -- --max-warnings 0
+	bun run lint -- --max-warnings 0
 
 test:
-	npm run test -- --browsers=ChromeHeadless --no-watch --no-progress --reporters progress --code-coverage
+	bun run test -- --browsers=ChromeHeadless --no-watch --no-progress --reporters progress --code-coverage
 
 run-main:
 	cd .. && act
@@ -24,7 +24,7 @@ reset:
 	docker ps -a --format '{{.Names}}' | grep -e '^act-' | xargs docker rm -f
 
 format-check:
-	cd .. && npm run format-check-all
+	cd .. && bun run bun:format-check-all
 
 lighthouse:
-	cd .. && npx --yes @lhci/[email protected] autorun
+	cd .. && bunx --yes @lhci/[email protected] autorun

.gitattributes

@@ -0,0 +1 @@
+*.lockb binary diff=lockb

.github/actions/setup/action.yml

@@ -3,11 +3,19 @@ description: Checks out the repository and installs tooling
 runs:
   using: 'composite'
   steps:
-    - name: Setup Node.js
-      uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d # v3
+    - name: Setup Bun
+      uses: oven-sh/setup-bun@v1
       with:
-        node-version-file: '.node-version'
-        cache: 'npm'
+        bun-version: latest
+    - name: Cache dependencies
+      uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3
+      env:
+        cache-name: bun-cache
+      with:
+        # Default as per docs 👇
+        # https://bun.sh/docs/runtime/bunfig#install-cache
+        path: ~/.bun/install/cache
+        key: ${{ env.cache-name }}-${{ hashFiles('**/bun.lockb') }}
     - name: Install dependencies
       shell: bash
       run: cd .ci && make install