Add permissions section to exercise 1, 2, and 3 workflows

Author: jacobsolbergholm

.github/workflows/exercise1_workflow.yml

@@ -1,6 +1,8 @@
 name: Workflow of exercise 1
 run-name: First workflow
 
+permissions: {}
+
 on: [push]
 
 jobs:

.github/workflows/exercise2_workflow.yml

@@ -1,6 +1,8 @@
 name: Workflow of exercise 2
 run-name: Second workflow
 
+permissions: {}
+
 on:
     push:
         branches: [ main ]

.github/workflows/exercise3_workflow.yml

@@ -1,6 +1,8 @@
 name: Workflow of exercise 3
 run-name: Third workflow
 
+permissions: {}
+
 on:
     push:
         branches: [ main ]