ci: declare contents: read on ci/e2e-test/integration-test workflows (#914)

All three workflows do pure CI runs (checkout + Go build/test, or e2e/
integration test execution). cli-validate.yml in this repo already declares
workflow-level contents: read; this brings the remaining three in line.

Signed-off-by: Arpit Jain <arpitjain099@gmail.com>

Author: arpitjain099

.github/workflows/ci.yml

@@ -6,6 +6,9 @@ on:
   push:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   lint:
     runs-on: ubuntu-latest

.github/workflows/e2e-test.yml

@@ -10,6 +10,9 @@ on:
   push:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   e2e-test:
     strategy:

.github/workflows/integration-test.yml

@@ -6,6 +6,9 @@ on:
     branches: [ main ]
   push:
 
+permissions:
+  contents: read
+
 jobs:
   integration-test:
     runs-on: ubuntu-latest