Implement can access protocols check

portal/static/js/gitlab.mjs

@@ -56,6 +56,11 @@ async function canAccess(imageUrl) {
 
 export async function isLoggedIn() {}
 
-export async function canAccessProtocols() {}
+/**
+ * @returns if the browser session has access to the protocols repo on GitLab
+ */
+export async function canAccessProtocols() {
+    return await canAccess("https://gitlab.cl.uni-heidelberg.de/api/v4/projects/1193/jobs/artifacts/master/raw/pixel.png?job=create-test-pixel")
+}
 
 export async function getLatestProtocolFileName() {}