no caching in test containers

test/probe_stow.sh

@@ -48,16 +48,20 @@ fi
 echo "== Probing stow packages: ${PACKAGES[*]} =="
 
 FAIL=0
+ERR_LOG="$(mktemp -t probe_stow.XXXXXX)"
+
+cleanup() { rm -f "$ERR_LOG"; }
+trap cleanup EXIT
+
 for pkg in "${PACKAGES[@]}"; do
     echo "--- stow --simulate: $pkg ---"
-    if stow --simulate --verbose=1 --dir="$REPO_ROOT" --target="$REPO_ROOT" "$pkg" >/dev/null 2>probe_err.txt; then
+    if stow --simulate --verbose=1 --dir="$REPO_ROOT" --target="$REPO_ROOT" "$pkg" >/dev/null 2>"$ERR_LOG"; then
         echo "ok: stow --simulate '$pkg' resolved without conflicts"
     else
         echo "FAIL: stow --simulate '$pkg'"
-        sed 's/^/    /' probe_err.txt
+        sed 's/^/    /' "$ERR_LOG"
         FAIL=$((FAIL+1))
     fi
-    rm -f probe_err.txt
 done
 
 # Cross-check: does the Makefile stow anything that is NOT in our package set?