workflows for commits and checks for PRs with `dev`

Author: PhilippBach

.github/workflows/test_build_docu_dev.yml

@@ -6,9 +6,11 @@ on:
   push:
     branches:
       - main
+      - dev
   pull_request:
     branches:
       - main
+      - dev
   workflow_dispatch:
     inputs:
       doubleml-py-branch:

.github/workflows/test_build_docu_released.yml

@@ -6,9 +6,11 @@ on:
   push:
     branches:
       - main
+      - dev
   pull_request:
     branches:
       - main
+      - dev
   workflow_dispatch:
   schedule:
     - cron: "0 9 * * 1,3,5"