Add permission blocks to other workflows (thanos-community#482)

An attempt to fix frozen actions on dependabot PRs.

Signed-off-by: Saswata Mukherjee <saswataminsta@yahoo.com>

Author: saswatamcode

.github/workflows/go.yml

@@ -14,6 +14,10 @@ env:
   golang-version: '1.25'
   kind-version: 'v0.30.0'
 
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   lint:
     runs-on: ubuntu-latest

.github/workflows/helm-chart.yml

@@ -18,6 +18,10 @@ env:
   kind-version: 'v0.30.0'
   kind-image: 'kindest/node:v1.34.0'
 
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   test-e2e:
     name: Run on Ubuntu