🌱 Include action execution for PR code

[Adirio]

☢️💀⚠️ Security Concerns ⚠️💀☢️

This GitHub Action has access to a GitHub token with Read and (more importantly) Write privileges to this repo. The use of this token within the master branch (current usage) can be controlled. However, usage in the PR branch (added in this PR) can be modified and the token could be leaked. A solution for this issue needs to be developed if the behavior introduced in this PR is desired.

Description

Aside from executing the live action from master, this PR includes a second job that executes the action from the PR branch.

Motivation

Currently, changes introduced by PR can only be tested after being merged into master. Adding this job allows to execute the action before merging so that its behavior can be reviewed before merging.

PoC

This PR has been merged in my ownh fork to showcase how it works. A dummy PR has been created to show both jobs.
P.S.: the action themselves are still broken (see #17, and #19) and will always success, so the outcome of the jobs is not relevant.
P.S.2: the PR content is just a trivial README.md file update, it is not relevant either.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[DirectXMan12]

So, there's a reason that we don't use this -- that GitHub token gives read-write access to the repository, which means that someone could do nefarious things just by submitting a PR if we run against the PR, so I don't think it's a good idea to merge this.

/hold

[Adirio]

Included a "Security Concern" alert at the top of this PR, and closing for now until a solution is provided.