chore: Migrate to SPDX headers

[nickvergessen]

No description provided.

[Antreesy]

Don't we need to set up a workflow for checking compliance? Or something for later?

[AndyScherzinger]

We have a GH action in the template repo but it will fail until you reach full compliance. So better get there first and than add the action, else you have a failing action on any PR until then.

[AndyScherzinger]

LGTM, just some very minor comments, 👍

[Antreesy]

There's around 60 files without a creation year in copyright header. But given amount of changes, I guess, we are good for now, that's something could be added for later, if CI is green now

[Antreesy]

UPD: here are missing years: 24ad3a6

directory="."
substring="SPDX-FileCopyrightText: Nextcloud"

# Find files recursively in the directory
find "$directory" -type f -exec grep -l "$substring" {} + | while IFS= read -r file
do
    # Get the creation year of the file
    creation_year=$(git log --diff-filter=A --follow --format=%aI "$file" | tail -n 1 | cut -d'-' -f1)
    echo "$creation_year"

    # Insert the creation year at the specified place in the file
    sed -i "s~$substring~SPDX-FileCopyrightText: $creation_year Nextcloud~g" "$file"
done

[nickvergessen]

Feel free to commit