ci: add workflow_dispatch trigger

Author: urish

.github/workflows/ci.yaml

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

.github/workflows/docs.yaml

@@ -8,6 +8,7 @@ on:
             - "mkdocs.yml"
             - "src/**"
             - ".github/workflows/docs.yml"
+    workflow_dispatch:
 
 permissions:
     pages: write