docker: fix version detection during docker build process

.dockerignore

 build*
 Dependencies/libcps/build*
-.git/
 Packaging/

.gitlab-ci.yml

@@ -95,6 +95,10 @@ build:docker:
     - docker build 
         --file Packaging/Docker/Dockerfile
         --build-arg DOCKER_TAG=${DOCKER_TAG}
+        --build-arg CI=1
+        --build-arg CI_COMMIT_SHA=${CI_COMMIT_SHA}
+        --build-arg CI_COMMIT_REF_NAME=${CI_COMMIT_REF_NAME}
+        --build-arg CI_COMMIT_TAG=${CI_COMMIT_TAG}
         --tag ${DOCKER_IMAGE}:${DOCKER_TAG}
         --tag ${DOCKER_IMAGE}:latest .
   tags:

Packaging/Docker/Dockerfile

 # rwthacs/dpsim-dev is built by dpsim-git/Packaging/Docker/Dockerfile.dev
 ARG DOCKER_TAG=latest
+ARG CI
+ARG CI_COMMIT_SHA
+ARG CI_COMMIT_REF_NAME
+ARG CI_COMMIT_TAG
+
 FROM rwthacs/dpsim-dev:${DOCKER_TAG} AS builder
 
 COPY . /dpsim/