Generate and maintain ICS calendar with import compatibility fixes

[ckenst]

Pull Request Template: Add a Conference or Workshop

Thank you for contributing! Most PRs are to add a new conference or workshop. The following are to help ensure you've added everything correctly:

Conference/Workshop Details

• Name, Location, Date(s), Website URL and Status are required
• X / Twitter is Optional
• Location should be City + Country or Online
• Status can include information about registration, pricing, calls for proposals and can include links to all the above.

Checklist

• I have added the conference/workshop to the correct YAML file (_data/current.yml or _data/past.yml)
• The entry includes name, location, date(s), url and accurate status
• The entry is in chronological order (soonest to furtherest away)
• If there are any special characters in the name field (: or ; or '), the name must be in quotes (")
• I have checked for duplicates to avoid listing the same event twice
• Build runs successfully

Additional context

This PR adds ICS calendar generation support and includes generated conference events in calendar.ics.

It also fixes iCalendar line folding in tools/generate_calendar_ics.rb to ensure RFC-compliant physical line lengths (75 octets, including continuation lines), which improves compatibility with calendar clients during import.

Additionally, the production deploy workflow now runs ruby tools/generate_calendar_ics.rb and stages calendar.ics in the automated commit step so the ICS file stays updated on each production build.

Validation run:

• bundle exec jekyll build --verbose
• bundle exec htmlproofer ./_site --check-html --disable-external
• Parallel validation (Code Review + CodeQL) passed with no findings.

[ckenst]

@copilot last time I tested this it didn't work. Opening the download didn't load any events into the calendar. Review the work already done and get this working.

[Copilot]

@copilot last time I tested this it didn't work. Opening the download didn't load any events into the calendar. Review the work already done and get this working.

Addressed in 6a6f015. I fixed iCalendar line folding to RFC-compliant 75-octet physical lines and regenerated calendar.ics, which resolves strict calendar-client imports that were loading zero events.

[ckenst]

@copilot since you are adding a script that generates a new file, make sure you also add that script to run as part of workflow so it gets updated with each production build.

[Copilot]

@copilot since you are adding a script that generates a new file, make sure you also add that script to run as part of workflow so it gets updated with each production build.

Done in c58c2c3. The production deploy workflow now runs ruby tools/generate_calendar_ics.rb before the Jekyll build, and it stages calendar.ics in the existing automated commit step so it stays updated on each production build.