adding an event on reading environment variable from /proc files

[h4l0gen]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind documentation

/kind tests

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area commands

/area pkg

/area events

What this PR does / why we need it: this event trigger rule read environment variable from /proc file Which issue(s) this PR fixes:

Fixes #111

Special notes for your reviewer:

[h4l0gen]

Hii @FedeDP @leogr this event triggered rule, PTAL. Thank You!!

[poiana]

LGTM label has been added.

Git tree hash: a0a4f8c832553bb2d20a8d6decb2ea61faf8ee49

[h4l0gen]

@leogr @FedeDP please add LGTM label again. I squashed commits again.

[poiana]

LGTM label has been added.

Git tree hash: 5d970b39ab615d28cb5b60d4fcb2aa1c90ff08a6

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: h4l0gen, leogr

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