fix(ci): add explicit permissions to lint.yml

CodeQL flagged lint.yml (actions/missing-workflow-permissions): no
permissions block anywhere in the file, so it runs with whatever the
repo's default token permissions are rather than what it actually
needs. It only checks out and reads the repo -- contents: read covers
everything the job does.

Signed-off-by: Jimisola Laursen <jimisola@jimisola.com>

Author: jimisola

.github/workflows/lint.yml

@@ -3,6 +3,9 @@ on:
   workflow_dispatch:
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
   linting:
     runs-on: ubuntu-latest