feat(copier): enhance copier.yml

[34j]

Closes #497

Environmental variables

The following environment variables can be optionally set to save some time and effort:

• copier.yml
  • PYPACKAGE_TEMPLATE_GITHUB_TOKEN or GITHUB_TOKEN
  • PYPACKAGE_TEMPLATE_GITHUB_USER†
  • PYPACKAGE_TEMPLATE_EMAIL†
  • PYPACKAGE_TEMPLATE_NAME†
• source/.github/setup-github.bash
  • PYPACKAGE_TEMPLATE_INSTALLATION_IDS (can be empty)

†: If not specified, gets values using github cli.
cli/cli#6096 (comment)

Requires jinja2-env to get enviromental variables.

New Features

• Create venv and activate it, then install packages
• Automatically set workflow permissions, branch protection rules and install applications for the repo.
• Run pre-commit autoupdate
• Avoid running unnecessary setup commands when running copier update
• Assume project name from copier command arguments using jinja2-eval
• Get copyright year using jinja2-time (which depends on arrow)
• Enable Windows test

Many features depend on each other and are difficult to separate PRs.

Todo

• update README.md
• fix sed command error in MacOS
• test manually
• understand why only some CI's are git config'd. (because --global flag was not set)

copier copy --trust --vcs-ref refine-copier "gh:34j/pypackage-template"