more info on build notification

.github/workflows/steamos_alpha.yml

@@ -73,8 +73,14 @@ jobs:
           cd build/steamos
           ~/Steam/steamcmd.sh +login $STEAM_USR +run_app_build $DEPOT +quit
 
+      - name: Set outputs
+        id: vars
+        run: |
+          echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+          echo "branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" >> $GITHUB_OUTPUT
+
       - name: Discord notification
         uses: appleboy/discord-action@v1.2.0
         with:
           webhook_url: ${{ secrets.DISCORD_WEBHOOK }}
-          message: New HEDZ-Reloaded alpha
+          message: New HEDZ-Reloaded alpha (${{ steps.vars.outputs.branch }}) [${{ steps.vars.outputs.sha_short }}]