feat: build F-Droid repo in CI

- introduce F-Droid repo in CI/CD

Fixes: #994

Signed-off-by: TheOneWithTheBraid <the-one@with-the-braid.cf>

fdroid/metadata/chat.fluffy.fluffychat.yml

@@ -0,0 +1,53 @@
+Categories:
+  - Internet
+  - Phone & SMS
+License: AGPL-3.0-only
+AuthorName: Famedly
+SourceCode: https://gitlab.com/famedly/fluffychat
+IssueTracker: https://gitlab.com/famedly/fluffychat/-/issues
+Translation: https://hosted.weblate.org/projects/fluffychat/
+Changelog: https://gitlab.com/ChristianPauly/fluffychat-flutter/-/blob/main/CHANGELOG.md
+
+AutoName: FluffyChat
+Summary: "Chat with your friends with FluffyChat.\n"
+Description: |
+    FluffyChat is an open, nonprofit and cute matrix messenger app for Ubuntu Touch, Android and iOS.
+
+    Open
+    Opensource and open development where everyone can join.
+
+    Nonprofit
+    FluffyChat is donation funded.
+
+    Cute ♥
+    Cute design and many theme settings including a dark mode. 
+
+    One-to-one and groupchats
+    Unlimited groups and direct chats.
+
+    Easy
+    FluffyChat is made as simple to use as possible.
+
+    Free
+    Free to use for everyone without ads.
+
+    Decentralized
+    There is no "FluffyChat server" you are forced to use. Use the server you find trustworthy or host
+    your own.
+
+    Compatible
+    Compatible with Riot, Fractal, Nekho and all matrix messengers.
+
+
+    FluffyChat comes with a dream
+
+    Imagine a world where everyone can choose the messenger they like and is still able to chat with
+    all of their friends.
+    A world where there are no companies spying on you when you send selfies to friends and lovers.
+    And a world where apps are made for fluffyness and not for profit. ♥
+
+RepoType: git
+Repo: https://gitlab.com/famedly/fluffychat.git
+
+AutoUpdateMode: None
+UpdateCheckMode: None