Filter the path for PR trigger and add codeowners (#248)

* Filter the path for PR trigger

* Add codeowners

* Fix syntax in pipeline

.github/CODEOWNERS

@@ -0,0 +1 @@
+@azure-rtos/admins

.github/workflows/ci_cortex_m0.yml

@@ -9,6 +9,11 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+    paths:
+      - ".github/workflows/ci_cortex_m0.yml"
+      - 'common/**'
+      - 'utility/**'
+      - 'ports/cortex_m0/gnu/**'
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:

.github/workflows/ci_cortex_m3.yml

@@ -9,6 +9,11 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+    paths:
+      - ".github/workflows/ci_cortex_m3.yml"
+      - 'common/**'
+      - 'utility/**'
+      - 'ports/cortex_m3/gnu/**'
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:

.github/workflows/ci_cortex_m4.yml

@@ -9,6 +9,11 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+    paths:
+      - ".github/workflows/ci_cortex_m4.yml"
+      - 'common/**'
+      - 'utility/**'
+      - 'ports/cortex_m4/gnu/**'
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:

.github/workflows/ci_cortex_m7.yml

@@ -9,6 +9,11 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+    paths:
+      - ".github/workflows/ci_cortex_m7.yml"
+      - 'common/**'
+      - 'utility/**'
+      - 'ports/cortex_m7/gnu/**'
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs: