run linter and tests workflow on demand

.github/workflows/linters.yml

@@ -5,6 +5,7 @@ on:
   pull_request:
     branches:
     - main
+  workflow_dispatch:
 
 jobs:
   jshint:

.github/workflows/tests.yml

@@ -5,6 +5,7 @@ on:
   pull_request:
     branches:
     - main
+  workflow_dispatch:
 
 jobs:
   unit-tests: