feat: add kubeconform workflow and make kubeconform/kustomize required (#1159)

.github/workflows/kubeconform.yaml

@@ -0,0 +1,28 @@
+---
+name: "Kubeconform"
+
+on:
+  pull_request:
+    branches: ["main"]
+    paths: ["kubernetes/**"]
+
+env:
+  KUBERNETES_DIR: ./kubernetes
+
+jobs:
+  kubeconform:
+    name: Kubeconform
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Homebrew
+        uses: Homebrew/actions/setup-homebrew@master
+
+      - name: Setup Workflow Tools
+        run: brew install fluxcd/tap/flux kubeconform kustomize
+
+      - name: Run kubeconform
+        shell: bash
+        run: ./.github/scripts/kubeconform.sh ${{ env.KUBERNETES_DIR }}