[ci] Add triggers to force builds

.github/workflows/focal-ci.yml

@@ -1,6 +1,9 @@
 name: CI Ubuntu Focal
 
 on:
+  repository_dispatch:
+    types:
+    - build-focal
   push:
     branches:
       - '**'

.github/workflows/jammy-ci.yml

@@ -1,6 +1,9 @@
 name: CI Ubuntu Jammy
 
 on:
+  repository_dispatch:
+    types:
+    - build-jammy
   push:
     branches:
       - '**'

.github/workflows/macos-ci.yml

@@ -1,6 +1,9 @@
 name: CI macOS
 
 on:
+  repository_dispatch:
+    types:
+    - build-macos
   push:
     branches:
       - '**'

.github/workflows/windows-ci.yml

@@ -1,6 +1,9 @@
 name: CI Windows
 
 on:
+  repository_dispatch:
+    types:
+    - build-windows
   push:
     branches:
       - '**'