fix: correct chart path and use absolute case dir path in integration test

Agent-Logs-Url: https://github.com/helmfile/helmfile/sessions/43b7a794-1e7b-4577-8829-deb544a1a105

Co-authored-by: yxxhero <11087727+yxxhero@users.noreply.github.com>

test/integration/test-cases/issue-2515.sh

@@ -1,4 +1,4 @@
-issue_2515_case_dir="${cases_dir}/issue-2515"
+issue_2515_case_dir="$(cd "${cases_dir}/issue-2515" && pwd)"
 issue_2515_tmp=$(mktemp -d)
 
 if [ "${HELMFILE_HELM4}" = "1" ]; then

test/integration/test-cases/issue-2515/input/helmfile.yaml

@@ -1,6 +1,6 @@
 releases:
 - name: issue-2515
-  chart: ../../charts/raw
+  chart: ../../../charts/raw
   values:
   - templates:
     - |