Dockerfile: use --no-install-recommends in apt-get install (RPi-Distr…

…o#383)

(cherry picked from commit 8ef3f47)

Dockerfile

@@ -3,11 +3,12 @@ FROM i386/debian:buster
 ENV DEBIAN_FRONTEND noninteractive
 
 RUN apt-get -y update && \
-    apt-get -y install \
+    apt-get -y install --no-install-recommends \
 	git vim parted \
 	quilt coreutils qemu-user-static debootstrap zerofree zip dosfstools \
 	bsdtar libcap2-bin rsync grep udev xz-utils curl xxd file kmod bc \
 	bison flex libssl-dev  build-essential libgtk-3-dev gcc-arm-linux-gnueabihf \
+    binfmt-support ca-certificates \
 	&& rm -rf /var/lib/apt/lists/*
 
 COPY . /pi-gen/