ci: declare workflow-level contents: read on 5 workflows (#1066)

ci: declare workflow-level contents: read on 5 workflows

Pins the default GITHUB_TOKEN to contents: read on the workflows in
.github/workflows/ that don't call a GitHub API beyond the initial
checkout. The other workflows in this directory are left implicit
because they need write scopes that a maintainer is better placed
to declare.

Motivation: CVE-2025-30066 (March 2025 tj-actions/changed-files
compromise) exfiltrated GITHUB_TOKEN from workflow logs. Per-workflow
caps bound runtime authority irrespective of repo or org default,
give drift protection if the default ever widens, and are credited
per-file by the OpenSSF Scorecard Token-Permissions check.

YAML validated locally with yaml.safe_load.

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

Author: arpitjain099

.github/workflows/deprecate-package.yml

@@ -23,6 +23,9 @@ on:
         required: true
         type: string
 
+permissions:
+  contents: read
+
 jobs:
   deprecate:
     name: Deprecate Package

.github/workflows/integration-tests-dev.yml

@@ -20,6 +20,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   test:
     timeout-minutes: 60

.github/workflows/quality.yml

@@ -12,6 +12,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   biome:
     name: "Biome"

.github/workflows/unit-tests.yml

@@ -13,6 +13,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   test:
     name: 'Test'

.github/workflows/visual-tests-schedule.yml

@@ -22,6 +22,9 @@ on:
         type: string
         required: false
 
+permissions:
+  contents: read
+
 jobs:
   test:
     timeout-minutes: 60