Add humble branch

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# Set update schedule for GitHub Actions
+# (https://docs.github.com/en/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-dependabot)
+
+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every week
+      interval: "weekly"

.github/workflows/build_and_test_humble.yaml

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+name: Build and Test (humble)
+
+on:
+  push:
+    branches: [ humble ]
+
+  pull_request:
+    branches: [ humble ]
+
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:jammy
+
+    steps:
+      - uses: ros-tooling/[email protected]
+        with:
+          use-ros2-testing: true
+      - uses: ros-tooling/[email protected]
+        with:
+          target-ros2-distro: humble