Feature: update permissions in gh actions

[davorrunje]

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Github organization is going to update the default permission defined by the permissions block in all workflows by end of January. If this block is not specified, I believe some of our workflows will fail because they require write access (e.g., release).

So, we will need to add a permission block to all workflows. Basically the Github Docs seems to indicate that we should probably be very conservative about permissions. One way to know which permission is required is to set permission to empty and see what breaks, and only add relevant permission.

name: "My workflow"

on: [ push ]

permissions: {}

jobs:
  ...

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