Update Dockerfile

[paulorangeljr]

Issue #, if available:

Description of changes: Skipping ssl verification for yum repositories on companies that enforces proxys, which can cause SSL certificate problem

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[ashishgupta-in]

You can add a flag check instead of directly specifying the changes.

[JohnChe88]

thank you @paulorangeljr and @ashishgupta-in let me review this