Set top-level permissions to `contents: read`

[tallaxes]

Description

Constrains top-level permissions for release-trigger

How was this change tested?

*

Does this change impact docs?

• [ ] Yes, PR includes docs updates
• [ ] Yes, issue opened: #
• [x] No

Release Note

[coveralls]

Pull Request Test Coverage Report for Build 10707870924

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.702%

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Totals
Change from base Build 10691347828:	0.0%
Covered Lines:	36313
Relevant Lines:	37167

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💛 - Coveralls