Exclude changes on markup files to trigger CI runs in master (#4084)

Fixes #4082

This tested fine in a fork, under various scenarios combining:
- Modify markup file in root dir
- Modify markup file in subdir
- Modify non-markup file
- In master
- In a PR

.github/workflows/cloud_integration.yml

@@ -1,6 +1,9 @@
 name: Cloud integration
 on:
   push:
+    paths-ignore:
+    - '*.md'
+    - '**/*.md'
     branches:
     - master
 jobs:

.github/workflows/kind_integration.yml

@@ -2,6 +2,9 @@ name: KinD integration
 on:
   pull_request: {}
   push:
+    paths-ignore:
+    - '*.md'
+    - '**/*.md'
     branches:
     - master
 jobs:

.github/workflows/static_checks.yml

@@ -2,6 +2,9 @@ name: Static checks
 on:
   pull_request: {}
   push:
+    paths-ignore:
+    - '*.md'
+    - '**/*.md'
     branches:
     - master
 jobs:

.github/workflows/unit_tests.yml

@@ -2,6 +2,9 @@ name: Unit tests
 on:
   pull_request: {}
   push:
+    paths-ignore:
+    - '*.md'
+    - '**/*.md'
     branches:
     - master
 jobs: