ci: add workflow to comment new Opened PRs (#2892)

* ci: add workflow to comment new Opened PRs

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Update comment-pr.yaml

eliminate a stray ' character that was terminating the shell script by slightly rewriting the prompt

Signed-off-by: Dave <dave@gray101.com>

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Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Signed-off-by: Dave <dave@gray101.com>
Co-authored-by: Dave <dave@gray101.com>