On June 21, Apple Watch users will be able to earn a special badge and animated iMessage stickers by completing Apple’s International Day of Yoga Challenge. Here’s how to get them. International Day of Yoga Challenge set for June 21 Apple regularly offers limited-time Activity Challenges tied to holidays and special events. This Sunday, Apple Watch users will be able to earn a new award in celebration of International Day of Yoga. Here’s what users need to do to earn the awards, according to Apple: “Share your practice with the planet on the International Day of Yoga. Record a yoga workout of 10 minutes or more on June 21 to earn this award.” Apple’s International Day of Yoga Challenge has varied over the years. In some years, users had to record a 20-minute yoga workout , while this year’s challenge requires only 10 minutes.…