UFZ: Update B2INST Urls in Dockerfiles

Description:

• Currently we're using:
  • B2INST_URL_ARG=b2inst-test.gwdg.de
  • B2INST_URL_ARG=b2inst.gwdg.de
• Must be changed to
  • B2INST_URL_ARG=https://b2inst-test.gwdg.de
  • B2INST_URL_ARG=https://b2inst.gwdg.de