Update testsuite.yml

Author: JanVogelsang

Diff for: .github/workflows/testsuite.yml

@@ -4,14 +4,15 @@
 name: FDSreader testsuite
 
 on:
+  workflow_dispatch: {}
   push:
     branches:
       - master
     paths:
-      - 'fdsreader'
+      - 'fdsreader/'
   pull_request:
     paths:
-      - 'fdsreader'
+      - 'fdsreader/'
 
 permissions:
   contents: read