CI Setup

[sudotensor]

Please refer to the associates issue (#4) for more information. In summary, a GitHub actions workflow was setup with jobs to build both the Mock and MCUboot examples. For now, the workflow only tests if the examples build without errors. For the the MCUboot example, "yes" is piped into the script to automate the version number change in mbed_app.json using the jq cli tool.

Note: It is not a strict requirement to test that these examples work on the target board through the workflow. However, this could be done at a later point through a separate workflow.

Closes #4

[sudotensor]

There was a small hiccup with this pull request. The request was merged before the workflow completed its run (and failed). I realised that the workflow was missing a critical dependency - the GCC ARM toolchain. main has been reset to its state before the pull request was merged through yet another pull request #7.

Update: The issue has been fixed through #8. ✅