Create convenience function for getting latest repo commit sha

src/utility/git.ts

@@ -0,0 +1,8 @@
+const GITHUB_API_URL =
+  'https://api.github.com/repos/sambecker/exif-photo-blog/commits/main';
+
+export const fetchLatestRepoCommit = async () => {
+  const response = await fetch(GITHUB_API_URL);
+  const data = await response.json();
+  return data.sha.slice(0, 7);
+};