Add permissions section to exercise 1, 2, and 4 workflows

Author: jacobsolbergholm

.github/workflows/exercise1_workflow.yml

@@ -1,7 +1,9 @@
 name: Workflow of exercise 1
 run-name: First workflow
 
-permissions: {}
+permissions: {
+    contents: read
+}
 
 on: [push]
 

.github/workflows/exercise2_workflow.yml

@@ -1,7 +1,9 @@
 name: Workflow of exercise 2
 run-name: Second workflow
 
-permissions: {}
+permissions: {
+    contents: read
+}
 
 on:
     push:

.github/workflows/exercise3_workflow.yml

@@ -1,7 +1,9 @@
 name: Workflow of exercise 3
 run-name: Third workflow
 
-permissions: {}
+permissions: {
+    contents: read
+}
 
 on:
     push:

.github/workflows/exercise4_workflow.yml

@@ -1,7 +1,9 @@
 name: Workflow of exercise 4
 run-name: Fourth workflow
 
-permissions: {}
+permissions: {
+    contents: read
+}
 
 on:
     push: