build: add k8s validation workflow

.github/testing/config.yml

@@ -0,0 +1,7 @@
+DRYDOCK_INIT_JOBS: true
+K8S_NAMESPACE: testing-openedx
+PLUGINS:
+- forum
+- mfe
+- minio
+- drydock

.github/testing/requirements.txt

@@ -0,0 +1 @@
+tutor[full]<18

.github/workflows/validation.yaml

@@ -0,0 +1,39 @@
+name: Kubernetes Validation
+
+on:
+  pull_request:
+    branches:
+      - main
+
+
+env:
+  TUTOR_ROOT: ./.github/testing
+
+jobs:
+  validation:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: setup python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+      - name: Install python reqs
+        run: |
+          pip install -r ./.github/testing/requirements.txt
+          pip install -e .
+          tutor plugins list
+          pip show setuptools
+      - name: Tutor config save
+        run: tutor config save
+      - name: Run Kubernetes tools
+        uses: alexellis/arkade-get@master
+        with:
+          kubectl: latest
+          kustomize: latest
+          helm: latest
+          kubeconform: latest
+      - name: Check k8s manifests
+        run: |
+          kustomize build $TUTOR_ROOT/env | kubeconform -strict -ignore-missing-schemas -kubernetes-version latest