fix: allow for relative paths for changelog file

Re nodejs/node#57343 (comment)

Signed-off-by: flakey5 <73616808+flakey5@users.noreply.github.com>

Author: flakey5

src/releases.mjs

@@ -35,12 +35,25 @@ const getChangelogFromFileSystem = async changelogUrl =>
  * @param {string} changelogPath The given URL to the Node.js CHANGELOG.md file
  */
 const createNodeReleases = changelogPath => {
-  const changelogUrl = new URL(changelogPath);
+  /**
+   * @type {Promise<string>}
+   */
+  let changelogStrategy;
+
+  try {
+    const changelogUrl = new URL(changelogPath);
+
+    changelogStrategy =
+      changelogUrl.protocol === 'file:'
+        ? getChangelogFromFileSystem(changelogUrl)
+        : getChangelogFromNetwork(changelogUrl);
+  } catch (err) {
+    if (err.code !== 'ERR_INVALID_URL') {
+      throw err;
+    }
 
-  const changelogStrategy =
-    changelogUrl.protocol === 'file:'
-      ? getChangelogFromFileSystem(changelogUrl)
-      : getChangelogFromNetwork(changelogUrl);
+    changelogStrategy = getChangelogFromFileSystem(changelogPath);
+  }
 
   /**
    * Retrieves all Node.js major versions from the provided CHANGELOG.md file