Add workflow_dispatch to all workflows

.github/workflows/single-header.yml

@@ -1,6 +1,8 @@
 name: single-header-ci
 
 on:
+  workflow_dispatch:
+
   push:
     branches:
       - master
@@ -15,8 +17,6 @@ on:
       - improvement/**
       - bugfix/**
 
-  workflow_dispatch:
-
 jobs:
   single_header_tests:
     if: >-

.github/workflows/ubuntu-latest-clang.yml

@@ -1,6 +1,8 @@
 name: ubuntu-latest-clang-ci
 
 on:
+  workflow_dispatch:
+
   push:
     branches:
       - master

.github/workflows/ubuntu-latest-gcc.yml

@@ -1,6 +1,8 @@
 name: ubuntu-latest-gcc-ci
 
 on:
+  workflow_dispatch:
+
   push:
     branches:
       - master

.github/workflows/ubuntu-latest-icc.yml

@@ -1,6 +1,8 @@
 name: ubuntu-latest-icc-ci
 
 on:
+  workflow_dispatch:
+
   push:
     branches:
       - master

.github/workflows/win-msvc.yml

@@ -1,6 +1,8 @@
 name: win-msvc-ci
 
 on:
+  workflow_dispatch:
+
   push:
     branches:
       - master

.github/workflows/win-msys2-clang.yml

@@ -1,6 +1,8 @@
 name: win-msys2-clang-ci
 
 on:
+  workflow_dispatch:
+
   push:
     branches:
       - master

.github/workflows/win-msys2-gcc.yml

@@ -1,6 +1,8 @@
 name: win-msys2-gcc-ci
 
 on:
+  workflow_dispatch:
+
   push:
     branches:
       - master