copilot-setup: use 'install' and skip Checkstyle during setup (#390)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Author: Copilot

.github/workflows/copilot-setup-steps.yml

@@ -40,4 +40,4 @@ jobs:
           cache: maven
 
       - name: Build with Maven
-        run: ./mvnw -B clean verify -DskipTests --file pom.xml
+        run: ./mvnw -B clean install -DskipTests -Dcheckstyle.skip=true --file pom.xml