Updates for gitlab path changes

.gitlab-ci.yml

-image: registry.gitlab.tugraz.at/dbp/dbp-api/api-core-bundle/main:v1
+image: registry.gitlab.tugraz.at/dbp/dbp-api/dbp-relay-core-bundle/main:v1
 
 before_script:
   - 'git config --global url."https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.tugraz.at/".insteadOf "git@gitlab.tugraz.at:"'

.gitlab-ci/README.md

 * In case of an incompatible change increase the tag version number in build.sh
 * ./build.sh
 * (first time) sudo docker login registry.gitlab.tugraz.at
-* sudo docker push registry.gitlab.tugraz.at/dbp/dbp-api/api-core-bundle/main:v1
+* sudo docker push registry.gitlab.tugraz.at/dbp/dbp-api/dbp-relay-core-bundle/main:v1
\ No newline at end of file

.gitlab-ci/build.sh

 #!/bin/bash
 
 set -e
-TAG="registry.gitlab.tugraz.at/dbp/dbp-api/api-core-bundle/main:v1"
+TAG="registry.gitlab.tugraz.at/dbp/dbp-api/dbp-relay-core-bundle/main:v1"
 sudo docker build --tag "${TAG}" --file "Dockerfile" .
 sudo docker run --rm --security-opt label=disable \
     --volume "$(pwd)/..:/home/user/app" --workdir "/home/user/app" \