I believe that we want to trigger actions/workflows when the workflow files in .github/workflows are updated; this is how we will know that they work :)
This pull request adds two examples and tests using the ESP-IDF framework:
* A test with the Arduino GFX library (which requires the arduino-esp32 library & Arduino BusIO library)
* A test without the Arduino GFX library, which can be compiled without any additional dependencies.
Having these tests helps prevent any future regressions that may break users of the ESP-IDF platform.
