Use humble with 2.x

Signed-off-by: cferreiragonz <carlosferreira@eprosima.com>

Author: cferreiragonz

.github/workflows/docker-reusable-workflow.yml

@@ -65,6 +65,7 @@ jobs:
     env:
       DDSROUTER_COMPOSE_TEST_DOCKER_IMAGE: "ddsrouter:ci"
       DDSROUTER_COMPOSE_TEST_ROS2_DOCKER_IMAGE: "vulcanexus:ci"
+      VULCANEXUS_IMAGE: ${{ startsWith(inputs.fastdds_branch, '2.') && 'eprosima/vulcanexus:humble-core' || 'eprosima/vulcanexus:jazzy-core' }}
 
     steps:
 
@@ -80,7 +81,7 @@ jobs:
           cd ./src/.github/docker/vulcanexus
           docker build \
             --no-cache \
-            --build-arg docker_image_base=eprosima/vulcanexus:jazzy-core \
+            --build-arg docker_image_base=${{ env.VULCANEXUS_IMAGE }} \
             -t ${{ env.DDSROUTER_COMPOSE_TEST_ROS2_DOCKER_IMAGE }} \
             -f Dockerfile .