[ci] workflow with dispatch and schedule

Add workflow_dispatch and schedule triggers to CI

Author: simogasp

.github/workflows/continuous-integration.yml

@@ -15,6 +15,9 @@ on:
       - '**.md'
       - '**.rst'
       - 'docs/**'
+  workflow_dispatch:
+  schedule:
+    - cron: "0 8 * * 1" 
 
 jobs:
   build-linux: