ci: add least-privilege permissions to test and lint jobs (#7)

Author: adityathebe

.github/workflows/ci.yml

@@ -10,6 +10,8 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     strategy:
       matrix:
         go-version: ["1.26.1"]
@@ -57,6 +59,8 @@ jobs:
   lint:
     name: Lint
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - name: Checkout code
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2