Automate feature changelog checking

.github/workflows/changelog-checker.yml

@@ -48,8 +48,8 @@ jobs:
               echo "Not found."
               echo ""
               echo "Did not find a changelog entry named ${expected_changelog_file}"
-              echo "If your changelog file is correct, skip this check with the 'pr/no-changelog' label"
-              echo "Reference - https://github.com/hashicorp/vault/pull/10363 and https://github.com/hashicorp/vault/pull/11894"
+              echo "If your changelog file is correct, or this change does not need a changelog, skip this check with the 'pr/no-changelog' label"
+              echo "Reference - https://github.com/hashicorp/vault/blob/main/CONTRIBUTING.md#changelog-entries"
               exit 1
             fi
 
@@ -76,6 +76,12 @@ jobs:
           elif grep -q ':fix$' "$changelog_files"; then
             echo "Found invalid type (fix) in changelog - did you mean bug?"
             exit 1
+          elif grep -q ':feature' "$changelog_files"; then
+            if ! grep -q 'feature\n**' "$changelog_files"; then
+              echo "Feature changelogs must be formatted like the following:"
+              echo "**Feature Name**: Feature description"
+              exit 1
+            fi
           elif ! grep -q '```release-note:' "$changelog_files"; then
             # People often make changelog files like ```changelog:, which is incorrect.
             echo "Changelog file did not contain 'release-note' heading - check formatting."