fix: adjust acceptance test action

[skip ci]

.github/actions/acc_test/action.yaml

@@ -143,6 +143,7 @@ runs:
 
     - name: Creating service_account file from json input
       if: inputs.service_account_json_content != ''
+      id: service_account
       shell: bash
       run: |
         echo "::group::create service account file"
@@ -161,6 +162,7 @@ runs:
           echo "${{ inputs.service_account_json_content }}" > stackit/"${{ inputs.service_account_json_file_path }}"
         fi
         ls -l stackit/"${{ inputs.service_account_json_file_path }}"
+        echo "safilepath=${PWD}/stackit/${{ inputs.service_account_json_file_path }}" >> "$GITHUB_OUTPUT"
         echo "::endgroup::"
 
     - name: Creating service_account file from base64 json input
@@ -226,10 +228,11 @@ runs:
         TF_ACC_KEK_KEY_RING_ID: ${{ inputs.tf_acc_kek_key_ring_id }}
         TF_ACC_KEK_KEY_VERSION: ${{ inputs.tf_acc_kek_key_version }}
         TF_ACC_KEK_SERVICE_ACCOUNT: ${{ inputs.tf_acc_kek_service_account }}
-        TF_ACC_SERVICE_ACCOUNT_FILE: "${PWD}/${{ inputs.service_account_json_file_path }}"
+        TF_ACC_SERVICE_ACCOUNT_FILE: ${{ steps.service_account.outputs.safile }}
       uses: robherley/go-test-action@v0
       with:
         testArguments: "./... -timeout ${{ inputs.test_timeout_string }}"
+        moduleDirectory: "stackit"
 
     - name: Run acceptance tests
       if: ${{ inputs.test_file == '' }}