fix: Dockerfile
set a static datestamp so that apt-get/dnf aren't run each time a new
docker container is built. Increment it if you want to refresh the
package databases in order to install new software or if something
is out of date.
diff --git a/initramfs-build.sh b/initramfs-build.sh
index 3ea2e08..26d4bcf 100755
--- a/initramfs-build.sh
+++ b/initramfs-build.sh
@@ -23,8 +23,8 @@
 
 ${PROXY}
 
-#RUN echo $(date +%s) && apt-get update
-RUN apt-get update
+# update datestamp below to force a cache refresh
+RUN echo 201603091439 && apt-get update
 RUN DEBIAN_FRONTEND=noninteractive apt-get upgrade -yy
 RUN DEBIAN_FRONTEND=noninteractive apt-get install -yy bc build-essential cpio git python unzip wget
 RUN groupadd -g ${GROUPS} ${USER} && useradd -d ${HOME} -m -u ${UID} -g ${GROUPS} ${USER}