[CI] Add ref checkout for scheduled docker builds (backport #461)

.github/workflows/humble-docker-build.yaml

@@ -18,5 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
+      with:
+        ref: humble
     - name: Build the Docker image
-      run: docker build . --file Dockerfile/Dockerfile --tag ros2_control_demos_humble
+      run: docker build --file Dockerfile/Dockerfile --tag ros2_control_demos_humble --build-arg ROS_DISTRO=humble .

.github/workflows/iron-docker-build.yaml

@@ -0,0 +1,24 @@
+name: Build Iron Dockerfile
+# description: builds the dockerfile contained within the repo
+
+on:
+  pull_request:
+    branches:
+      - iron
+  push:
+    branches:
+      - iron
+  schedule:
+    # Run every morning to detect broken dependencies
+    - cron: '50 1 * * *'
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        ref: iron
+    - name: Build the Docker image
+      run: docker build --file Dockerfile/Dockerfile --tag ros2_control_demos_iron --build-arg ROS_DISTRO=iron .

.github/workflows/rolling-docker-build.yaml

@@ -0,0 +1,24 @@
+name: Build Rolling Dockerfile
+# description: builds the dockerfile contained within the repo
+
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+  schedule:
+    # Run every morning to detect broken dependencies
+    - cron: '50 1 * * *'
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        ref: master
+    - name: Build the Docker image
+      run: docker build --file Dockerfile/Dockerfile --tag ros2_control_demos_rolling --build-arg ROS_DISTRO=rolling .