BAEL-5095 Dockerfile strategies for Git (#11348)

Co-authored-by: majewsk6 <krzysztof.majewski.km1@contractors.roche.com>

docker/dockerfile-with-git/.gitmodules

@@ -0,0 +1,4 @@
+[submodule "project"]
+  path = project
+  url = https://github.com/eugenp/tutorials.git
+  branch = master

docker/dockerfile-with-git/Dockerfile

@@ -0,0 +1,13 @@
+ADD . /project/
+ADD /build/ /project/
+ADD /output/project.jar /project/
+
+ADD ssh-private-key /root/.ssh/id_rsa
+RUN git clone git@github.com:eugenp/tutorials.git
+
+ARG username=$GIT_USERNAME
+ARG password=$GIT_PASSWORD
+RUN git clone https://username:password@github.com:eugenp/tutorials.git
+
+VOLUME /build/ /project/
+