Limit token permissions in GitHub workflows (#440)

See
ea7e27ed41/docs/checks.md (token-permissions)

.github/workflows/ci-integ-test-full.yml

@@ -6,13 +6,13 @@ on:
     paths:
     - 'dist/**'
 
-permissions:
-  contents: write
-
 concurrency:
   group: integ-test
   cancel-in-progress: false
 
+permissions:
+  contents: read
+
 jobs:
   caching-integ-tests:
     uses: ./.github/workflows/suite-integ-test-caching.yml
@@ -25,6 +25,8 @@ jobs:
     secrets: inherit
 
   other-integ-tests:
+    permissions:
+      contents: write
     uses: ./.github/workflows/suite-integ-test-other.yml
     concurrency:
       group: CI-integ-test-full