Fix Maven cache path for container job

Co-authored-by: franz1981 <13125299+franz1981@users.noreply.github.com>

Author: Copilot

.github/workflows/loom-tests.yml

@@ -32,7 +32,7 @@ jobs:
     - name: Cache Maven packages
       uses: actions/cache@v5
       with:
-        path: ~/.m2
+        path: /github/home/.m2
         key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
         restore-keys: ${{ runner.os }}-m2