Add lolin_s2_mini to build.yml for board Lolin S2 Mini

Author: durapensa

.github/workflows/build.yml

@@ -521,6 +521,7 @@ jobs:
         - "gravitech_cucumber_r"
         - "gravitech_cucumber_rs"
         - "lilygo_ttgo_t8_s2_st7789"
+        - "lolin_s2_mini"
         - "microdev_micro_s2"
         - "morpheans_morphesp-240"
         - "muselab_nanoesp32_s2_wroom"