Update K9-Mail to 6.715 (beta)

metadata/com.fsck.k9.yml

@@ -6,7 +6,7 @@ SourceCode: https://github.com/thunderbird/thunderbird-android
 IssueTracker: https://github.com/thunderbird/thunderbird-android/issues
 Translation: https://hosted.weblate.org/projects/tb-android/
 Changelog: https://thunderbird.github.io/thunderbird-android/changelog_6.6-MAINT_branch.xml
-Donate: https://k9mail.app/go/donate
+Donate: https://mzla.link/k9-give
 
 AutoName: K-9 Mail
 
@@ -1314,9 +1314,23 @@ Builds:
     scandelete:
       - build-plugin/build
 
+  - versionName: '6.715'
+    versionCode: 37015
+    commit: '6.715'
+    subdir: app-k9mail
+    sudo:
+      - apt-get update
+      - apt-get install -y openjdk-17-jdk-headless
+      - update-alternatives --auto java
+    gradle:
+      - yes
+    scandelete:
+      - build-plugin/build
+
 MaintainerNotes: |-
   Use output instead of subdir to make gradlew-fdroid correctly determine the gradle version to be used.
   It doesn't work when using subdir because we are two levels deep into the directory structure.
+  From version 6.715 on this is not true anymore and subdir should be used as the app was moved to app-k9mail folder.
 
 AutoUpdateMode: None
 UpdateCheckMode: None