system tests removed maven caching

caching doesn't seem to find artefacts to cache. Also building from different branches may cause problems when restoring built artifacts. So for now no caching

.github/workflows/system-tests.yml

@@ -118,14 +118,6 @@ jobs:
           cache: 'maven'
           java-version: 21
 
-      - name: Cache local Maven repository
-        uses: actions/cache@v4
-        with:
-          path: ~/.m2/repository
-          key: ${{ runner.os }}-maven-${{ hashFiles('./ditto*/**/pom.xml') }}
-          restore-keys: |
-            ${{ runner.os }}-maven-
-
       - name: Set env vars dynamically
         run: |
           echo "JAVA_TOOL_OPTIONS=-Duser.home=$HOME" >> $GITHUB_ENV