grep only first instance, as there are now multiple ids on the page... [skip ci]

.gitlab-ci.yml

@@ -19,7 +19,7 @@ build-job:
     - python3 setup.py sdist bdist_wheel
     - apt-get install -y -qq curl
     # get the current package id
-    - 'export ID=$(curl --request GET --header "PRIVATE-TOKEN: ${API_ACCES_TOKEN}" "https://git.gfz-potsdam.de/api/v4/projects/${CI_PROJECT_ID}/packages" | grep -P "(?<=.id.:)(\\d+)" -o )' 
+    - 'export ID=$(curl --request GET --header "PRIVATE-TOKEN: ${API_ACCES_TOKEN}" "https://git.gfz-potsdam.de/api/v4/projects/${CI_PROJECT_ID}/packages" | grep -P "(?<=.id.:)(\\d+)" -o  | head -1)' 
     # remove the package, as we want a new build even if the version number did not change
     - 'echo $ID'
     - 'curl --request DELETE --header "PRIVATE-TOKEN: ${API_ACCES_TOKEN}" "https://git.gfz-potsdam.de/api/v4/projects/${CI_PROJECT_ID}/packages/$ID"'