ci: add a hook to add open-tyndp header automatically

[tgilon]

Closes #90.

Changes proposed in this Pull Request

Builds on #92 and #93, this PR adds a local hook to enforce the correct SPDX header in modified and newly created files. Currently, this hook is disabled in pre-commit-ci.

A PR has been opened in reuse-tool (fsfe/reuse-tool#1206) to support missing files / types.

Checklist

• I tested my contribution locally and it works as intended.
• Code and workflow changes are sufficiently documented.
• Changed dependencies are added to envs/environment.yaml.
• Changes in configuration options are added in config/config.default.yaml.
• Changes in configuration options are documented in doc/configtables/*.csv.
• Changes in configuration options are added in config/test/*.yaml.
• OET license identifier is added to all edited or newly created code files.
• Sources of newly added data are documented in doc/data_sources.rst.
• A release note doc/release_notes.rst is added.
• Major features are listed in README and doc/index.rst.

[coroa]

Since you are skipping the hook in ci, then you could use the simpler form without the git processing.

[tgilon]

Since you are skipping the hook in ci, then you could use the simpler form without the git processing.

Would you mind keeping it? That way, I can test it locally for a while before making it mandatory with pre-commit-ci.

[tgilon]

From several discussions:

• Automation would be too intrusive. Rather default opt-out instead of opt-in.
• Script that does this is helpful if it is done consciously (with tracking of the diff)
• Maybe something like a button