Enabled gosec and fixed security issue

[aneeshkp]

Enabled gosec and fixed three sec issues

1. Linter: gosec, Rule: G306 - Poor file permissions used
   [Key file permissions are not correct, should be 600 or 660]
2. G304: Potential file inclusion via variable
3. Use of net/http serve function that has no support for setting timeouts (gosec) err := http.ListenAndServe(address, mux)

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This pull-request has been approved by: aneeshkp, jzding

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[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: cloud-event-proxy
This PR has been included in build cloud-event-proxy-container-v4.18.0-202411081938.p0.g7bbec54.assembly.stream.el9.
All builds following this will include this PR.