ci: route jobs to the gradle and light runners (#385)

Moves Gradle jobs to the dedicated `gradle` runner (capacity 1, 8g per job) and the cheap gate/lint jobs to `light`. Two runners used to share the `docker` label, so two Gradle builds could run at once and the VPS ran out of memory. Only `runs-on` lines change.

Co-authored-by: Jean-Luc Makiola <business@jeanlucmakiola.de>
Reviewed-on: https://codeberg.org/jlmakiola/calendula/pulls/385

.gitea/workflows/beta.yaml

@@ -15,7 +15,7 @@ jobs:
   detect:
     # Gitea only; see the same guard in release.yaml.
     if: github.repository_owner == 'makiolaj'
-    runs-on: docker
+    runs-on: light
     outputs:
       is_beta: ${{ steps.v.outputs.is_beta }}
       version: ${{ steps.v.outputs.version }}
@@ -41,7 +41,7 @@ jobs:
   beta:
     needs: detect
     if: needs.detect.outputs.is_beta == 'true'
-    runs-on: docker
+    runs-on: gradle
     env:
       ANDROID_HOME: /opt/android-sdk
       ANDROID_SDK_ROOT: /opt/android-sdk

.gitea/workflows/release.yaml

@@ -43,7 +43,7 @@ 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 }}
@@ -85,7 +85,7 @@ 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