Try building with this image

.circleci/config.yml

@@ -2,19 +2,17 @@ version: 2
 jobs:
   build:
     docker:
-      - image: debian:stretch
-      - image: docker:18.06-git
+      - image: alexswensen/pi-gen-container:latest
     steps:
-      # - checkout
+      - checkout
       # - run:
       #     name: Install Dependencies
       #     command: apt-get -y update && apt-get -y install git vim parted quilt realpath qemu-user-static debootstrap zerofree pxz zip dosfstools bsdtar libcap2-bin rsync grep udev xz-utils curl xxd file && rm -rf /var/lib/apt/lists/*
 
-      # - run:
-      #     name: Create required directories
-      #     command: |
-      #       mkdir work
+      - run:
+          name: list files
+          command: mount -i -o remount,exec,dev /root
       - run:
           name: Build Raspbian
-          command: ./build-docker.sh
+          command: ./build.sh
           no_output_timeout: 30m