Update Github actions to their latest versions to fix the following
warnings on runs:
```
Node.js 16 actions are deprecated. Please update the following actions
to use Node.js 20: actions/checkout@v3, actions/cache@v3,
actions/upload-artifact@v3. For more information see:
https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.
```
`actions/checkout` and `actions/cache` are straight Node version
upgrades, `actions/upload-artifact` and `actions/download-artifact` have
breaking changes, but don't appear to affect our usage.
https://github.com/actions/upload-artifact
Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
A simple workflow that runs when a PR is merged and updates the
elasticsearch index with merged PR info.
The dashboard for displaying the information can be found here:
https://kibana.zephyrproject.io/
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
