[integration tests] add simple API admin test

.github/integration/sda/config.yaml

@@ -1,6 +1,8 @@
 log:
   format: "json"
   level: "debug"
+admin:
+  users: "[email protected]"
 archive:
   type: s3
   url: "http://s3"

.github/integration/tests/sda/60_api_admin_test.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -e
+
+token="$(curl http://oidc:8080/tokens | jq -r '.[0]')"
+result="$(curl -sk -L "http://api:8080/users/[email protected]/files" -H "Authorization: Bearer $token" | jq '. | length')"
+if [ "$result" -ne 4 ]; then
+    echo "wong number of files returned for user [email protected]"
+    echo "expected 4 got $result"
+    exit 1
+fi