Add: environment variables for sh scripts

Signed-off-by: urpylka <urpylka@gmail.com>

image/Jenkinsfile-build

@@ -9,6 +9,10 @@ pipeline {
     PREFIX_PATH = '/mnt'
     DEV_BOOT = '/dev/disk/by-uuid/CDD4-B453'
     DEV_ROOTFS = '/dev/disk/by-uuid/72bfc10d-73ec-4d9e-a54a-1cc507ee7ed2'
+
+    DEBIAN_FRONTEND = 'noninteractive'
+    LANG = 'C.UTF-8'
+    LC_ALL = 'C.UTF-8'
   }
   stages {
     stage('Get image') {