github-action: add pr builder for easier testing

[shwstppr]

Adds a Github action to build binary for Linux x86-64 for easier testing of PRs. A comment will be added in the PR.
Workflow runs on pull_request_target and has two jobs - build, comment.
comment job needs issues:write permission due to which the workflow can run only when it is present on main.
build job only has read permission to prevent insecure permissions

Tested here: shwstppr#3

[shwstppr]

This needs whitelisting peter-evans/find-comment@v3 and peter-evans/create-or-update-comment@v4
If that can't be done I can try to modify workflow to not use them
cc @DaanHoogland @rohityadavcloud

[DaanHoogland]

@shwstppr how about adding make dist and attach the contents of the dist dir to the pr? in that way arm/windows users will have binaries to test as well.

[shwstppr]

@shwstppr how about adding make dist and attach the contents of the dist dir to the pr? in that way arm/windows users will have binaries to test as well.

done

[DaanHoogland]

clgtm

[weizhouapache]

@shwstppr
awesome !

the GHA run 3 times, is it intended ?
https://github.com/shwstppr/cloudstack-cloudmonkey/pull/3/checks

[shwstppr]

@weizhouapache I think that is some GHA discrepancy in general as it is also showing build (on: pull_request) runner multiple times too. I'll check though

[shwstppr]

Not working without community actions. Closing for now

[shwstppr]

Works on shwstppr#3 now