ci: follow up fixes to release-please (#532)

Ignores the `CHANGELOG.md` in prettier, to allow for the
`release-please` formatting to be accepted

And fixes the formatting workflow, have it request correct permissions

Author: voxpelli

.github/workflows/format.yml

@@ -9,6 +9,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: write
+
 jobs:
   format:
     if: github.repository == 'eslint-community/eslint-plugin-promise'

.prettierignore

@@ -1,2 +1,3 @@
 .github/release-please/manifest.json
 coverage
+CHANGELOG.md