feat(actions): Add linting and testing

.github/workflows/lint-test.yaml

@@ -0,0 +1,58 @@
+name: Lint and Test Charts
+
+on:
+  push:
+    branches: [master]
+    paths:
+      - "charts/**"
+      - ".github/workflows/**"
+  pull_request:
+    branches: [master]
+    paths:
+      - "charts/**"
+  workflow_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.6.1
+
+      - name: Run chart-testing (lint)
+        run: ct lint --config .github/ct-lint-config.yaml
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Install Helm
+        uses: azure/setup-helm@v4
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.6.1
+
+      - name: Run chart-testing (list-changed)
+        id: list-changed
+        run: |
+          changed=$(ct list-changed --chart-dirs charts --target-branch ${{ github.event.repository.default_branch }})
+          if [[ -n "$changed" ]]; then
+            echo "changed=true" >> $GITHUB_OUTPUT
+          fi
+      - name: Run chart-testing (lint)
+        run: |
+          helm repo add bjw-s https://bjw-s.github.io/helm-charts
+          ct lint --chart-dirs charts --all
+
+      - name: Create kind cluster
+        uses: helm/kind-action@v1.10.0
+
+      - name: Run chart-testing (install)
+        run: ct install --config .github/ct-install-config.yaml