Set permissions for GitHub actions (#1838)

- Included permissions for the action. https://github.com/ossf/scorecard/blob/main/docs/checks.md#token-permissions

https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions

https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs

[Keeping your GitHub Actions and workflows secure Part 1: Preventing pwn requests](https://securitylab.github.com/research/github-actions-preventing-pwn-requests/)

 Restrict the GitHub token permissions only to the required ones; this way, even if the attackers will succeed in compromising your workflow, they won’t be able to do much.

Signed-off-by: naveensrinivasan <[email protected]>

Author: naveensrinivasan

.github/workflows/build-dev.yml

@@ -12,6 +12,9 @@ on:
     tags:
       - '*'
 
+permissions:
+  contents: read
+
 jobs:
   nuget:
     runs-on: ubuntu-latest

.github/workflows/pull-request.yml

@@ -2,6 +2,9 @@ name: Build and test PRs
 
 on: [pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: windows-latest