check copyright headers

[bernhardreiter]

Hi @schacht-certat,

grep -r SPDX-FileCopyrightText | grep --invert-match Intevation

shows a number of files, where the SPDX-FileCopyrightText should probably be checked,
like

.github/workflows/mypy.yml:#SPDX-FileCopyrightText: 2020 IntelMQ Team
intelmq_api/intelmq-api.wsgi:SPDX-FileCopyrightText: 2020 Birger Schacht

the former does not seem to be a legal entity and both miss contact details like an url, what about

SPDX-FileCopyrightText: 2020 nic.at GmbH <https://nic.at>

? :)

We are already in the process of discussing this internally at CERT.at

[sebix]

Assigning this to @waldbauer-certat as he represents CERT.at