Configure baseline profiles in the baselineProfile lambda

This is the correct and easiest way to set up baseline profiles
correctly. See b/313428246 for more context.

Change-Id: Iea68ba5bcdbf62f377cae146ff56603448458726

app/build.gradle.kts

@@ -54,8 +54,6 @@ android {
             // who clones the code to sign and run the release variant, use the debug signing key.
             // TODO: Abstract the signing configuration to a separate file to avoid hardcoding this.
             signingConfig = signingConfigs.getByName("debug")
-            // Ensure Baseline Profile is fresh for release builds.
-            baselineProfile.automaticGenerationDuringBuild = true
         }
     }
 
@@ -72,6 +70,20 @@ android {
     namespace = "com.google.samples.apps.nowinandroid"
 }
 
+baselineProfile {
+    saveInSrc = false
+    // Don't build on every iteration of a full assemble.
+    // Instead enable generation directly for the release build variant.
+    automaticGenerationDuringBuild = false
+    mergeIntoMain = true
+    variants {
+        create("release") {
+            // Ensure Baseline Profile is fresh for release builds.
+            automaticGenerationDuringBuild = true
+        }
+    }
+}
+
 dependencies {
     implementation(projects.feature.interests)
     implementation(projects.feature.foryou)