add Gitea workflow

.gitea/workflows/android.yml

@@ -0,0 +1,36 @@
+name: Android CI
+
+on:
+  push:
+    branches: [ main, master, develop ]
+  pull_request:
+
+jobs:
+  android:
+    runs-on: android-kmp
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Make Gradle executable
+        run: chmod +x ./gradlew
+
+      - name: Gradle cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+            ~/.konan
+          key: gradle-${{ runner.os }}-${{ hashFiles('**/*.gradle*', '**/libs.versions.toml', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            gradle-${{ runner.os }}-
+
+      - name: Build and test
+        run: |
+          ./gradlew \
+            check \
+            assembleDebug \
+            --no-daemon \
+            --max-workers=2 \
+            -Dorg.gradle.jvmargs="-Xmx3g -XX:MaxMetaspaceSize=1g"