[CI] Avoid to run worklow on some files changed

which does not impact compilation.

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

.github/workflows/Continuous-Integration.yml

@@ -1,5 +1,19 @@
 name: STM32 Core Continuous Integration
-on: [push, pull_request]
+on:
+  push:
+    paths-ignore:
+      - '*.json'
+      - '**.md'
+      - keywords.txt
+      - CI/**
+      - tools/**
+  pull_request:
+    paths-ignore:
+      - '*.json'
+      - '**.md'
+      - keywords.txt
+      - CI/**
+      - tools/**
 jobs:
   astyle_check:
     runs-on: ubuntu-latest
@@ -36,4 +50,4 @@ jobs:
       if: failure()
       run: |
         cat ${{ steps.Compile.outputs.compile-result }}
-        exit 1
+        exit 1