ci: route jobs to the gradle and light runners

Gradle jobs now run on the dedicated gradle runner (one at a time, 8g
cap) instead of the shared docker label, which let two Gradle builds run
in parallel and run the VPS out of memory. Cheap gate, lint and deploy
trigger jobs move to the light runner.

.gitea/workflows/release.yaml

@@ -48,7 +48,7 @@ jobs:
     # secrets. repository_owner differs between the two forges regardless of
     # URL, proxy or instance rename, so this closes it permanently.
     if: github.repository_owner == 'makiolaj'
-    runs-on: docker
+    runs-on: light
     outputs:
       is_release: ${{ steps.v.outputs.is_release }}
       version: ${{ steps.v.outputs.version }}
@@ -123,7 +123,7 @@ jobs:
   release:
     needs: detect
     if: needs.detect.outputs.is_release == 'true' || github.event_name == 'workflow_dispatch'
-    runs-on: docker
+    runs-on: gradle
     env:
       ANDROID_HOME: /opt/android-sdk
       ANDROID_SDK_ROOT: /opt/android-sdk