fix: [#90] add explicit permissions to coverage workflow

Co-authored-by: josecelano <[email protected]>

Author: Copilot

.github/workflows/coverage.yml

@@ -7,6 +7,9 @@ on:
 env:
   CARGO_TERM_COLOR: always
 
+permissions:
+  contents: read
+
 jobs:
   coverage:
     name: Coverage Report