Ignore markdown files for github actions (#3676)

.github/workflows/cgroup2.yaml

 name: cgroup2
-on: [push, pull_request]
+on:
+  push:
+    paths-ignore: 
+      - "**.md"
+  pull_request:
+    paths-ignore:
+      - "**.md"
 jobs:
   build:
     name: "Build"

.github/workflows/unitcoverage.yaml

 name: Unit Test Coverage
-on: [push, pull_request]
+on: 
+  push:
+    paths-ignore: 
+      - "**.md"
+  pull_request:
+    paths-ignore:
+      - "**.md"
 jobs:
   test:
     name: Unit Tests