Fix app links icon upload

dashboard/src/utils.js

@@ -589,6 +589,22 @@ function stripSsoInfo(notes, sso) {
   return notes.replace(/<sso>.*?<\/sso>/gs, '').replace(/<nosso>/gs, '').replace(/<\/nosso>/gs, '');
 }
 
+function getDataURLFromFile(file) {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+
+    reader.onload = function(event) {
+      resolve(event.target.result);
+    };
+
+    reader.onerror = function(event) {
+      reject(event.target.error);
+    };
+
+    reader.readAsDataURL(file);
+  });
+}
+
 // named exports
 export {
   download,
@@ -599,6 +615,7 @@ export {
   taskNameFromInstallationState,
   redirectIfNeeded,
   stripSsoInfo,
+  getDataURLFromFile
 };
 
 // default export
@@ -611,4 +628,5 @@ export default {
   taskNameFromInstallationState,
   redirectIfNeeded,
   stripSsoInfo,
+  getDataURLFromFile
 };