fix: configure ruff with a temp cache (#5548)

- Configure Ruff to store its cache in a temporary directory inside the
  container by default. Users can still override this by providing a
  configuration file for Ruff.
- Add tests to ensure that super-linter deletes temporary files and
  directories.

Close #5543

TEMPLATES/.ruff.toml

@@ -1,3 +1,6 @@
+# Store the cache in a temporary location
+cache-dir = "/tmp/.ruff_cache"
+
 # Same as .flake8
 line-length = 120
 

test/run-super-linter-tests.sh

@@ -127,3 +127,21 @@ if [ ${SUPER_LINTER_EXIT_CODE} -ne ${EXPECTED_EXIT_CODE} ]; then
 else
   echo "Super-linter exited with the expected code: ${SUPER_LINTER_EXIT_CODE}"
 fi
+
+# Check if super-linter leaves leftovers behind
+declare -a TEMP_ITEMS_TO_CLEAN
+TEMP_ITEMS_TO_CLEAN=()
+TEMP_ITEMS_TO_CLEAN+=("$(pwd)/.lintr")
+TEMP_ITEMS_TO_CLEAN+=("$(pwd)/.mypy_cache")
+TEMP_ITEMS_TO_CLEAN+=("$(pwd)/.ruff_cache")
+TEMP_ITEMS_TO_CLEAN+=("$(pwd)/logback.log")
+
+for item in "${TEMP_ITEMS_TO_CLEAN[@]}"; do
+  echo "Check if ${item} exists"
+  if [[ -e "${item}" ]]; then
+    echo "Error: ${item} exists and it should have been deleted"
+    exit 1
+  else
+    echo "${item} does not exist as expected"
+  fi
+done