Add github action

Author: erichlf

.github/workflows/testing.yml

@@ -0,0 +1,12 @@
+name: "testing"
+on: pull_request
+jobs:
+  testing:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: ros-tooling/[email protected]
+      - uses: ros-tooling/[email protected]
+        with:
+          package-name: py_tree_parser
+          target-ros2-distro: humble
+          vcs-repo-file-url: https://raw.githubusercontent.com/sam-xl/py_trees_parser/humble/dependencies.repos