update Dockerfile

Signed-off-by: Peter Siegmund <developer@mars3142.org>

Dockerfile

@@ -11,7 +11,7 @@ USER app
 
 # Copy all needed project files to a folder
 COPY --chown=app ./gradle/ ./gradle
-COPY --chown=app ./gradlew ./build.gradle ./settings.gradle ./
+COPY --chown=app ./gradlew ./build.gradle ./settings.gradle ./app.json ./
 COPY --chown=app ./src ./src
 
 # Build the production package