Add Testers Day 2026 (CFP page)

[Selfeer]

It seems I’ve added everything required for the upcoming event. One note: the website currently only includes the CFP page. Details such as the agenda, venue, and a dedicated event page will be added later.
Is it okay to merge this now and update the main event link in a separate PR afterward?

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