fix up pipfile for arm/v7

.github/workflows/ci.yml

@@ -107,7 +107,7 @@ jobs:
         uses: docker/setup-qemu-action@v1
       -
         name: Cache Docker layers
-        uses: pat-s/always-upload-cache@v2.1.3
+        uses: actions/cache@v2
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}

Dockerfile

@@ -38,6 +38,7 @@ RUN apt-get update \
 		icc-profiles-free \
 		imagemagick \
 		libatlas-base-dev \
+		libffi-dev \
 		liblept5 \
 		libmagic-dev \
 		libpoppler-cpp-dev \