There is no such thing as a permanent contract in Turkey. Forcing an employee to work more than a month, or vice versa forcing an employer to keep you employed for more than one month after notice is not possible in practice. Usually they just don't care about renewing your working permit or license validation if they want to terminate, and there is nothing you can do about it.
If they are unable to find locals to upgrade or DECs then you might be upgraded but when a local is ready to take your spot you are out for sure. Go there for the food, money, weather and the hours and maybe a new type-rating. I wouldn't go there for many other causes as a yabanci.