Add CI workflows (to be used with ArduinoCore-API integration)

[giulcioffi]

In order to test that the ArduinoCore-API integration (#560 ) doesn't break the compilation of the main libraries/examples, a workflow for CI has been put in place. The compile-examples workflow compiles:

• internal core libraries + examples
• some of the most used libraries + related examples
• all the basic examples provided in the Arduino IDE
• Memory usage information collection is always enabled and handled by the report-size-deltas workflow.

[per1234]

Suggested change

	name: size-deltas-reports
	path: size-deltas-reports
	name: sketches-reports
	path: sketches-reports

The default sketches report path of the arduino/compile-sketches action and the default workflow artifact name of the arduino/report-size-deltas action were changed by arduino/compile-sketches#7, so this change must accompany the actions name changes.

[per1234]

Oops, I see I forgot about this and made a duplicate suggestion for the same change in my newer review below:
#567 (comment)

[per1234]

Since you set matrix.board.type to usb for this board, I suspect you intended for the paths under matrix.include[].board.type.usb to be compiled for it, but what is happening is the value of the matrix.board.additional-sketch-paths key is being overwritten. So it only ends up containing the single path ~/Arduino/libraries/MKRGSM/examples, as you can see from this workflow log;
https://github.com/giulcioffi/ArduinoCore-samd/runs/1263161053?#step:7:16602

You can fix this by using a dedicated key for each, like matrix.board.additional-usb-sketch-paths and matrix.board.additional-sketch-paths . You can see an example of that here:
https://github.com/arduino/arduino-examples/blob/main/.github/workflows/compile-examples.yml

[per1234]

Since none of the existing matrix items match the matrix.include filter, this creates a new matrix element.
https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#example-including-new-combinations
You can see the fqbn: '"arduino:samd:mkrwan1300" "arduino:samd:mkrwan1310"' job here;
https://github.com/giulcioffi/ArduinoCore-samd/runs/1263161214
and the jobs for the fqbn: arduino:samd:mkrwan1300 and fqbn: arduino:samd:mkrwan1310 matrix elements:
https://github.com/giulcioffi/ArduinoCore-samd/runs/1263161020
https://github.com/giulcioffi/ArduinoCore-samd/runs/1263161034

Apparently the arduino/compile-sketches action accepts the input fqbn: "arduino:samd:mkrwan1300" "arduino:samd:mkrwan1310"and ends up just compiling only for the MKR WAN 1300.

You could add a general "WAN" attribute property to the matrix, something like what I did in this workflow:
https://github.com/arduino/arduino-examples/blob/main/.github/workflows/compile-examples.yml
The only problem is that, as you see here, when no matrix element matches the filter, one is created, which is why I had to define those properties for all the boards in the matrix, rather than only for the boards the property applied to.

You could also just add a separate matrix.include filter for each of the MKR WAN boards board.fqbn values.

---

This also has the same issue as I described above for arduino:samd:mkrgsm1400 of overwriting the previous value of additional-sketch-paths for arduino:samd:mkrwan1300.

[per1234]

Same issue as I described above for arduino:samd:mkrgsm1400 of overwriting the previous value of additional-sketch-paths.

[per1234]

I'm guess that the use of the development version of the Keyboard library is because that version has an example sketch added:
arduino-libraries/Keyboard@a587425

but that example sketch is just a copy/paste of the KeyboardSerial example in the built-in examples:
https://github.com/arduino/arduino-examples/blob/main/examples/09.USB/Keyboard/KeyboardSerial/KeyboardSerial.ino
which the workflow is already configured to compile.

So there would be no loss of coverage from using the release version of the library and removing the ~/Arduino/libraries/Keyboard/examples/Serial path from env.UNIVERSAL_SKETCH_PATHS

[per1234]

Suggested change

	# Use Board Manager to install the latest release of Arduino megaAVR Boards to get the toolchain
	# Use Board Manager to install the latest release of Arduino SAMD Boards to get the toolchain

[per1234]

Suggested change

	name: size-deltas-reports
	path: size-deltas-reports
	name: sketches-reports
	path: sketches-reports

This change is required due to a recent breaking change to the arduino/compile-sketches action's default sketches report path and to the arduino/report-size-deltas action's default workflow artifact name:
arduino/compile-sketches#7
arduino/report-size-deltas#7

[per1234]

Great work @giulcioffi !

[aentinger]

Fantastic work @giulcioffi 🚀