Use bash instead of dash

It's actually slightly smaller.

Dockerfile.in

@@ -55,7 +55,7 @@ RUN mkdir -p {ARG_STAGING}
 COPY stage_binaries.sh /
 RUN /stage_binaries.sh -o {ARG_STAGING} \
 	-p base-files \
-	-p dash \
+	-p bash \
 	-p coreutils \
 	-p git \
 	-p openssh-client \
@@ -69,6 +69,7 @@ RUN /stage_binaries.sh -o {ARG_STAGING} \
 	-f /etc/os-release \
 	-f /etc/passwd \
 	-f /tmp
+RUN ln -s /bin/bash {ARG_STAGING}/bin/sh # Not sure why this is not set up automatically
 
 FROM scratch as intermediate