allow running github workflows on branches manually

Author: titusfortner

.github/workflows/java.yml

@@ -7,6 +7,7 @@ on:
   pull_request:
     branches:
       - trunk
+  workflow_dispatch:
 
 env:
   NODE_VERSION: '13.x'

.github/workflows/javascript.yml

@@ -23,6 +23,7 @@ on:
       - common/**
       - package.json
       - package-lock.json
+  workflow_dispatch:
 jobs:
   node_tests:
     runs-on: ubuntu-latest

.github/workflows/python.yml

@@ -25,6 +25,7 @@ on:
       - javascript/cdp-support/**
       - javascript/webdriver/**
       - py/**
+  workflow_dispatch:
 
 jobs:
   tox_flake8:

.github/workflows/ruby.yml

@@ -7,6 +7,7 @@ on:
   pull_request:
     branches:
       - trunk
+  workflow_dispatch:
 
 jobs:
   build: