Lightly grease a 10 inch pie pan. In a medium-large glass bowl, melt the butter in the microwave. Add the molasses, salt, ginger, and cinnamon and mix. Stir in the sugar. Add the GF flour and mix until a thick dough forms. Evenly press the dough into the prepared pie pan and poke all over the bottom surface with a fork. Place the pan in the freezer while you preheat the oven to 375 degrees F (190 C). Once the oven is heated, bake the crust for about 15 minutes, remove from the oven, and let it cool completely.