Violation of the separation of church and state? (Arizona)

To my mind, this case definitely violates the separation of church and state since this procedure is based on a governmental decision. The children at school are told to pray or to mediate before their classes start. This means that the students are in a way forced to do so and even the ones that are undenominational must pray.
It remains questionable whether these regulations are stipulated by the school itself or by the government. If the latter is the case, the separation of church and state would clearly be violated because the government would directly interfere with the school's decisions. On the other hand, if it was a school internal decision, it may appear not to be a violation but in a wider sense it is because in the end, everything happens on a public school.