try drone maybe

.drone.yml

@@ -0,0 +1,25 @@
+kind: pipeline
+type: kubernetes
+name: build-apk
+
+clone:
+  depth: 1
+
+steps:
+  - name: build
+    image: cirrusci/flutter:stable
+    pull: true
+    commands:
+      - flutter packages get
+      - flutter build apk --release --split-per-abi
+      - mkdir apks
+      - mv build/app/outputs/apk/*/*/*.apk apks
+
+  - name: Publish APK
+    image: plugins/gitea-release
+    settings:
+      api_key:
+        from_secret: GITEA_TOKEN
+trigger:
+  event:
+    - push