Add helper function to update change during merge workflow

.github/scripts/updateChangelog.js

@@ -0,0 +1,18 @@
+/**
+ * Updates the changelog by replacing the changelog header with the correct version
+ *
+ * @param {string} changelogString the content of the changelog file
+ * @param {string} version the player version to be released
+ * @param {string} releaseDate the release date to be written to the changelog
+ */
+function updateChangeLog(changelogString, version, releaseDate) {
+    const optionalBetaOrRc = '(-rc.d+)?(-(b|beta).d+)?';
+    const changelogVersionRegExp = new RegExp(
+      `\\[(development|develop|unreleased|${version})${optionalBetaOrRc}.*`,
+      'gi',
+    );
+    return changelogString.replace(changelogVersionRegExp, `[${version}] - ${releaseDate}`);
+  }
+
+  module.exports.updateChangeLog = updateChangeLog;
+