Fix CI workflow (#441)

* Update workflow trigger
* Update Visual Studio version
* Use gcovr from apt instead of pip

Signed-off-by: Florian Dupuy <florian.dupuy@rte-france.com>
Co-authored-by: Mathieu BAGUE <mathieu.bague@rte-france.com>
Co-authored-by: Sébastien LAIGRE <slaigre@silicom.fr>

.github/workflows/ci.yml

@@ -7,7 +7,12 @@
 
 name: CI
 
-on: [push]
+on:
+  push:
+    branches:
+      - 'main'
+      - 'release-v**'
+  pull_request:
 
 defaults:
   run:
@@ -73,7 +78,7 @@ jobs:
       - name: Install LibXml2
         shell: cmd
         run: |
-          call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
+          call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
           choco install wget --no-progress
           wget -nv %LIBXML2_URL%
           7z x v2.9.10.zip
@@ -121,7 +126,9 @@ jobs:
           java-version: 11
 
       - name: Install gcovr
-        run: sudo pip install gcovr
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y gcovr
 
       - name: Install Sonar wrapper
         working-directory: ${{ runner.workspace }}