Merge branch 'add_datamodel' into 'main'

.gitlab-ci.yml

ldvspec/Dockerfile

ldvspec/ldvspec/settings/base.py

ldvspec/ldvspec/settings/ci.py

ldvspec/lofardata/admin.py

ldvspec/lofardata/migrations/0002_defines_dataproduct.py

ldvspec/lofardata/models.py

ldvspec/lofardata/serializers.py

ldvspec/lofardata/templates/lofardata/base.html

ldvspec/lofardata/templates/lofardata/index.html

ldvspec/lofardata/tests.py

ldvspec/lofardata/tests/__init__.py

ldvspec/lofardata/tests/test_data_filter.py

ldvspec/lofardata/tests/test_dataproduct.py

ldvspec/lofardata/tests/test_location.py

ldvspec/lofardata/urls.py

ldvspec/lofardata/views.py

ldvspec/manage.py

ldvspec/requirements/base.txt