Added test action for matrix notification

Signed-off-by: fastlorenzo <[email protected]>

.github/workflows/test-matrix.yaml

@@ -0,0 +1,18 @@
+on: [push]
+
+jobs:
+  send-message:
+    runs-on: ubuntu-latest
+    name: Send message via Matrix
+    steps:
+    - name: Send message to test channel
+      id: matrix-chat-message
+      uses: fadenb/[email protected]
+      with:
+        homeserver: 'matrix.org'
+        token: ${{ secrets.MATRIX_TOKEN }}
+        channel: '!KluZWhQwHDYrOfqJdD:make-it.fr'
+        message: |
+          This is an *example message* using **markdown** for formatting.\
+          Use a `\` character at the end of a line to cause a linebreak (the whole message is treated as markdown).\
+          You can use variables like ${{ github.sha }} anywhere.