added cache-from to build-process

Changelog.md

 # Changelog
 
+## [1.2.4] - 2018-12-17
+### Added
+* reintroduced image-import prior to build
+
 ## [1.2.3] - 2018-11-05
 ### Changed
 * option `--certificate-authority` is now optional, so you do not need to provide it in case your apiserver is using a valid public certificate
@@ -38,3 +42,4 @@
 [1.2.1]: https://git.sc.uni-leipzig.de/ubl/bdd_dev/webmasterei/deployer/compare/release%2F1.2.0...release%2F1.2.1
 [1.2.2]: https://git.sc.uni-leipzig.de/ubl/bdd_dev/webmasterei/deployer/compare/release%2F1.2.1...release%2F1.2.2
 [1.2.3]: https://git.sc.uni-leipzig.de/ubl/bdd_dev/webmasterei/deployer/compare/release%2F1.2.2...release%2F1.2.3
+[1.2.4]: https://git.sc.uni-leipzig.de/ubl/bdd_dev/webmasterei/deployer/compare/release%2F1.2.3...release%2F1.2.4

assets/deployer

@@ -349,7 +349,7 @@ build_image() {
 	echo -ne "building image..."
 
 	local out
-	local cmd="docker build --pull"
+	local cmd="docker build --pull --cache-from=${image_name}"
 
 	for arg in $buildargs;do
 		echo "adding $arg to build command"
@@ -438,6 +438,7 @@ fi
 
 case $1 in
 	build)
+		import_image
 		build_image && save_image
 		;;
 	publish)