Add permission to build workflow for codecov (#7432)

# Description

This is to enable to use GitHub App token in workflow for codecov.

## Type of change

- This pull request is a minor refactor, code cleanup, test improvement,
or other maintenance task and doesn't change the functionality of Radius
(issue link optional).

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Please update the following to link the associated issue. This is
required for some kinds of changes (see above).

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Fixes: #issue_number

---------

Signed-off-by: Young Bu Park <[email protected]>

.github/workflows/build.yaml

@@ -28,6 +28,13 @@ on:
       - features/*
       - release/*
 
+permissions:
+  id-token: write      # Required for requesting the JWT
+  contents: write      # Required for creating releases
+  checks: write        # Required for updating check runs
+  pull-requests: write # Required for updating pull requests
+  packages: write      # Required for uploading the package
+
 concurrency:
   # Cancel the previously triggered build for only PR build.
   group: build-${{ github.ref }}-${{ github.event.pull_request.number || github.sha }}