use install helper

Author: alexnuttall

tests/pact-tests/run-pact-tests.sh

@@ -2,8 +2,23 @@
 
 set -euo pipefail
 
+install_package() {
+  local package=$1
+  local tmplog
+  tmplog="$(mktemp)"
+
+  pnpm install --no-lockfile "$package" 2>&1 | tee "$tmplog"
+
+  if grep -q 'ERR_PNPM' "$tmplog"; then
+    echo "Error: pnpm install failed for $package" >&2
+    exit 1
+  fi
+
+  pnpm list "$package"
+}
+
 # Ensure we have the latest package matching the major version
-npm install --no-lockfile @nhsdigital/nhs-notify-event-schemas-letter-rendering@^2.0.0
+install_package @nhsdigital/nhs-notify-event-schemas-letter-rendering@^2
 
 # Remove old PACTs
 rm -rf ./.pacts