ci: purge cloudflare cache when changes to app dir

Signed-off-by: Logan McAnsh <logan@mcan.sh>

.github/workflows/purge-cache.yml

@@ -0,0 +1,33 @@
+name: ♻️ Purge Cloudflare cache
+
+on:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    name: ♻️ Purge Cloudflare cache
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: ⬇️ Checkout repo
+        uses: actions/checkout@v4
+
+      - name: 📝 Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@v40.2.1
+        with:
+          path: "./app"
+
+      - name: ♻️ Purge Cloudflare cache
+        if: ${{ github.ref == 'refs/heads/main' }} && steps.changed-files.outputs.any_changed == 'true'
+        uses: jakejarvis/cloudflare-purge-action@v0.3.0
+        env:
+          CLOUDFLARE_ZONE: ${{ secrets.CLOUDFLARE_ZONE }}
+          CLOUDFLARE_TOKEN: ${{ secrets.CLOUDFLARE_TOKEN }}
+          PURGE_URLS: '["https://www.mcan.sh", "https://www.mcan.sh/resume", "https://www.mcan.sh/resume.pdf"]'