register atomic workflows by adding a pull_request trigger; to be rem…

…oved after registering

.github/workflows/_changelog-entry-check.yml

@@ -1,6 +1,7 @@
 name: "Changelog entry check"
 
 on:
+    pull_request:
     workflow_call:
         inputs:
             package:

.github/workflows/_code-quality.yml

@@ -1,6 +1,7 @@
 name: "Code quality"
 
 on:
+    pull_request:
     workflow_call:
         inputs:
             branch:

.github/workflows/_generate-changelog.yml

@@ -1,6 +1,7 @@
 name: "Changelog generation"
 
 on:
+    pull_request:
     workflow_call:
         inputs:
             package:

.github/workflows/_package-directory.yml

@@ -1,6 +1,7 @@
 name: "Package directory"
 
 on:
+    pull_request:
     workflow_call:
         inputs:
             package:

.github/workflows/_publish-internal.yml

@@ -1,6 +1,7 @@
 name: "Publish internally"
 
 on:
+    pull_request:
     workflow_call:
         inputs:
             package:

.github/workflows/_publish-pypi.yml

@@ -1,6 +1,7 @@
 name: "Publish to PyPI"
 
 on:
+    pull_request:
     workflow_call:
         inputs:
             package:

.github/workflows/_unit-tests.yml

@@ -1,6 +1,7 @@
 name: "Unit tests"
 
 on:
+    pull_request:
     workflow_call:
         inputs:
             package:

.github/workflows/_verify-build.yml

@@ -1,6 +1,7 @@
 name: "Verify build"
 
 on:
+    pull_request:
     workflow_call:
         inputs:
             package: