Add workflow_dispatch to workflows

Author: vjee

.github/workflows/deploy-docs.yml

@@ -1,6 +1,7 @@
 name: Deploy docs
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main

.github/workflows/e2e-tests.yml

@@ -1,6 +1,7 @@
 name: E2E Tests
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main

.github/workflows/unit-tests.yml

@@ -1,6 +1,7 @@
 name: Unit Tests
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main