add workflow_dispatch for manual trigger

Author: hathach

.github/workflows/cmake_arm.yml

@@ -1,6 +1,7 @@
 name: CMake ARM
 
 on:
+  workflow_dispatch:
   push:
     paths:
       - 'src/**'

.github/workflows/pre-commit.yml

@@ -1,6 +1,7 @@
 name: pre-commit
 
 on:
+  workflow_dispatch:
   push:
   pull_request:
     branches: [ master ]

.github/workflows/trigger.yml

@@ -1,6 +1,7 @@
 name: Trigger Repos
 
 on:
+  workflow_dispatch:
   push:
     branches: master
   release: