Build script updates

Always compress with gzip unless we are doing a release.  Also download
rootfs.tar to ${DOWNLOAD} so `dapper -m bind` works better.

scripts/dev

@@ -6,4 +6,4 @@ cd $(dirname $0)
 
 ./build
 ./prepare
-INSTALLER=0 COMPRESS="gzip -1" ROOTFS=0 ./package
+INSTALLER=0 ROOTFS=0 ./package

scripts/package-initrd

@@ -11,7 +11,7 @@ INITRD=${ARTIFACTS}/initrd
 mkdir -p ${ARTIFACTS}
 
 if [ "$COMPRESS" == "" ]; then
-    COMPRESS=lzma
+    COMPRESS="gzip -1"
 fi
 
 cd ${INITRD_DIR}

scripts/release

@@ -3,5 +3,6 @@ set -e
 
 source $(dirname $0)/version
 export REPO_VERSION=$VERSION
+export COMPRESS=lzma
 
 exec $(dirname $0)/ci