Name the release APK space.rcmd.android.sizzle_<versionCode>.apk

Configure the release variant's output filename (via the legacy applicationVariants
API) so the unsigned release APK is stamped with its versionCode — e.g.
space.rcmd.android.sizzle_4.apk — to simplify uploading to the private F-Droid
repo. Staging keeps its app-staging.apk name.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/build.gradle.kts

@@ -86,6 +86,20 @@ android {
     }
 }
 
+// Give the release APK a predictable, versionCode-stamped name so it drops straight
+// into the private F-Droid repo: space.rcmd.android.sizzle_<versionCode>.apk. Uses
+// the legacy variant API (the Kotlin-DSL `android {}` receiver doesn't expose it).
+(extensions.getByName("android") as com.android.build.gradle.AbstractAppExtension)
+    .applicationVariants.all {
+        if (buildType.name == "release") {
+            val vc = versionCode
+            outputs.all {
+                (this as com.android.build.gradle.internal.api.BaseVariantOutputImpl)
+                    .outputFileName = "space.rcmd.android.sizzle_$vc.apk"
+            }
+        }
+    }
+
 dependencies {
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)