Add Permissions to github Workflows

Imrove GITHUB_TOKEN permissions in the workflows.

Signed-off-by: Soule BA <soule@weave.works>

.github/workflows/e2e.yaml

@@ -6,6 +6,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read # for actions/checkout to fetch code
+
 jobs:
 
   kind-linux-amd64:

.github/workflows/nightly.yml

@@ -7,6 +7,9 @@ on:
 env:
   REPOSITORY: ${{ github.repository }}
 
+permissions:
+  contents: read # for actions/checkout to fetch code
+
 jobs:
   build:
     runs-on: ubuntu-latest

.github/workflows/scan.yaml

@@ -8,6 +8,10 @@ on:
   schedule:
     - cron: '18 10 * * 3'
 
+permissions:
+  contents: read # for actions/checkout to fetch code
+  security-events: write # for codeQL to write security events
+
 jobs:
   fossa:
     name: FOSSA