plugins/auth-backend: add script for starting up saml test idp

plugins/auth-backend/scripts/.gitignore

@@ -0,0 +1 @@
+*.pem

plugins/auth-backend/scripts/start-saml-idp.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+if [[ ! -f idp-public-cert.pem ]]; then
+  echo "Generating new SAML Certificates"
+  openssl req \
+    -x509 \
+    -newkey rsa:1024 \
+    -days 3650 \
+    -nodes \
+    -subj '/CN=localhost' \
+    -keyout "idp-private-key.pem" \
+    -out "idp-public-cert.pem"
+fi
+
+echo "Downloading and starting SAML-IdP"
+export NPM_CONFIG_REGISTRY=https://registry.npmjs.org
+exec npx saml-idp --acsUrl "http://localhost:3003/auth/saml/handler/frame" --audience "http://localhost:3003"