TT#36350 Create dirs in docker images

Create directories to place files with repo information and gpg key
during building of grml-sipwise iso.

Change-Id: I9ed158b085ea6caaab6a34ce74b5f66ec0f80ce7

grml_build/Dockerfile

@@ -5,7 +5,7 @@ FROM docker.mgm.sipwise.com/sipwise-stretch:latest
 # is updated with the current date. It will force refresh of all
 # of the base images and things like `apt-get update` won't be using
 # old cached versions when the Dockerfile is built.
-ENV REFRESHED_AT 2018-09-08
+ENV REFRESHED_AT 2019-02-28
 
 RUN apt-get update && apt-get install --assume-yes \
   bc \
@@ -40,6 +40,9 @@ RUN git clone https://github.com/grml/grml-live
 
 WORKDIR /code/grml-live
 
+RUN mkdir -p /code/grml-live/etc/grml/fai/config/files/etc/apt/sources.list.d/sipwise.list/ \
+  /code/grml-live/etc/grml/fai/config/files/etc/apt/trusted.gpg.d/sipwise-keyring.gpg/
+
 ### Usage instructions #############################################################################
 ## Build docker image:
 #