require hashes and binary wheels for pip

.github/workflows/static.yml

@@ -19,7 +19,7 @@ jobs:
     - run: sudo apt-get update
     - run: sudo apt-get -y install libxml2-utils yajl-tools moreutils zopfli
     - run: npm install
-    - run: pip install -r requirements.txt
+    - run: 'pip install --require-hashes --only-binary :all: -r requirements.txt'
 
     - name: process static
       run: ./process-static