CI: first build, then assemble

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

Author: tobiasKaminsky

.github/workflows/assembleFlavors.yml

@@ -15,6 +15,23 @@ concurrency:
     cancel-in-progress: true
 
 jobs:
+    build:
+        runs-on: ubuntu-latest-max
+        steps:
+            -   uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+            -   name: set up JDK 21
+                uses: actions/setup-java@dd06d9cba3e5552c54d9f8ea23572deb30010f7c # v6.0.0
+                with:
+                    distribution: "temurin"
+                    java-version: 21
+            -   uses: gradle/actions/wrapper-validation@9c971963bec38e04b3d30dcc455b5382be2fdbfb # v6.3.0
+            -   name: compile
+                run: |
+                    echo "org.gradle.jvmargs=-Xmx6g -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8 -XX:+UseParallelGC -XX:MaxMetaspaceSize=1g" >> gradle.properties
+                    echo "org.gradle.caching=true" >> gradle.properties
+                    echo "org.gradle.parallel=true" >> gradle.properties
+                    echo "org.gradle.configureondemand=true" >> gradle.properties
+                    ./gradlew app:compileGenericDebugSources
     flavor:
         runs-on: ubuntu-latest
         strategy: