Allow user github-actions[bot] to update translations.

Check that new strings are not added to `values/strings.xml`
Signoff not required for "github-actions[bot]" user.

libraries/ui-strings/src/main/res/values/strings_eax.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <!-- Add new strings for Element X Android here -->
+
+</resources>

tools/danger/dangerfile.js

@@ -74,6 +74,7 @@ const allowList = [
     "fedrunov",
     "Florian14",
     "ganfra",
+    "github-actions[bot]",
     "jmartinesp",
     "jonnyandrew",
     "kittykat",
@@ -116,8 +117,18 @@ if (github.requested_reviewers.users.length == 0 && !pr.draft) {
 }
 
 // Check that translations have not been modified by developers
-if (user != "RiotTranslateBot") {
+const translationAllowList = [
+    "RiotTranslateBot",
+    "github-actions[bot]",
+]
+
+if (!translationAllowList.includes(user)) {
    if (editedFiles.some(file => file.endsWith("strings.xml") && !file.endsWith("values/strings.xml"))) {
-       fail("Some translation files have been edited. Only user `RiotTranslateBot` (i.e. translations coming from Weblate) is allowed to do that.\nPlease read more about translations management [in the doc](https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#internationalisation).")
+       fail("Some translation files have been edited. Only user `RiotTranslateBot` (i.e. translations coming from Weblate) or `github-actions[bot]` (i.e. translations coming from automation) are allowed to do that.\nPlease read more about translations management [in the doc](https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#internationalisation).")
+   }
+
+   // Check that new strings are not added to `values/strings.xml`
+   if (editedFiles.some(file => file.endsWith("ui-strings/src/main/res/values/strings.xml"))) {
+      fail("`ui-strings/src/main/res/values/strings.xml` has been edited. This file will be overridden in the next strings synchronisation. Please add new strings in the file `values/strings_eax.xml` instead.")
    }
 }