Build test image with pulp_workflow server plugin

Assisted-By: GitHub Copilot (Claude Opus 4.8)

Author: daviddavis

.ci/assets/Containerfile

@@ -0,0 +1,7 @@
+ARG FROM_TAG="latest"
+FROM ghcr.io/pulp/pulp:${FROM_TAG}
+
+ARG PULP_WORKFLOW_VERSION=""
+
+RUN pip3 install --upgrade \
+  pulp-workflow${PULP_WORKFLOW_VERSION}

.github/workflows/test.yml

@@ -18,11 +18,15 @@ jobs:
       matrix:
         include:
           - image_tag: "nightly"
+            from_tag: "nightly"
+            container_file: "Containerfile"
             pulp_api_root: "/relocated/djnd/"
-            python: "3.11"
+            python: "3.14"
           - image_tag: "latest"
+            from_tag: "latest"
+            container_file: "Containerfile"
             lower_bounds: true
-            python: "3.8"
+            python: "3.10"
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v6"