ci: rebuild sharp from source for FreeBSD runner

.github/workflows/deploy.yml

@@ -14,6 +14,9 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Rebuild sharp for FreeBSD
+        run: npm rebuild sharp --build-from-source
+
       - name: Fetch homepage config from node jail
         run: |
           mkdir -p ~/.ssh