Add variable MERGE_RESULT in order to launch docker build image

.github/workflows/sync-merge.yaml

@@ -42,3 +42,12 @@ jobs:
           merge_args: ${{ env.MERGE_ARGS }}
           push_args: ${{ env.PUSH_ARGS }}
           spawn_logs: ${{ env.SPAWN_LOGS }}
+          run: echo $MERGE_RESULT >> $GITHUB_ENV
+
+
+  docker:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: use var
+        run: echo"${{ env.MERGE_RESULT }}"