[ci] permissions:contents:write

Author: cocoa-xu

.github/workflows/nerves-build.yml

@@ -39,6 +39,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: write
+
 jobs:
   mix-firmware:
     runs-on: ubuntu-20.04