Set minimal permissions for GH Actions

Signed-off-by: Ole Herman Schumacher Elgesem <ole.elgesem@northern.tech>

Author: olehermanse

.github/workflows/black-check.yml

@@ -9,6 +9,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   check:
     runs-on: ubuntu-22.04

.github/workflows/black-format.yml

@@ -1,5 +1,9 @@
 name: Automatically format with Black and submit PR
 
+permissions:
+  contents: read
+  pull-requests: write
+
 on:
   push:
     branches:

.github/workflows/tests.yml

@@ -9,6 +9,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   python_version:
     runs-on: ubuntu-22.04