Testing CI for the helm chart

.github/ct.yaml

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+target-branch: main
+helm-extra-args: --timeout 600
+check-version-increment: true
+debug: true

.github/kubeval.sh

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+#!/bin/bash
+set -euo pipefail
+
+CHART_DIR="trains-server-charts"
+KUBEVAL_VERSION="0.15.0"
+SCHEMA_LOCATION="https://raw.githubusercontent.com/instrumenta/kubernetes-json-schema/master/"
+
+# install kubeval
+curl --silent --show-error --fail --location --output /tmp/kubeval.tar.gz https://github.com/instrumenta/kubeval/releases/download/"${KUBEVAL_VERSION}"/kubeval-linux-amd64.tar.gz
+tar -xf /tmp/kubeval.tar.gz kubeval
+
+# validate chart
+helm template "${CHART_DIR}" | ./kubeval --strict --ignore-missing-schemas --kubernetes-version "${KUBERNETES_VERSION#v}" --schema-location "${SCHEMA_LOCATION}"

.github/workflows/ci.yaml

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+name: Lint and Test Charts
+
+on:
+  pull_request:
+    paths:
+      - 'trains-server-chart/**'
+
+jobs:
+  lint-chart:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Run chart-testing (lint)
+        uses: helm/chart-testing-action@master
+        with:
+          command: lint
+          config: .github/ct.yaml
+  kubeval-chart:
+    runs-on: ubuntu-latest
+    needs:
+      - lint-chart
+    strategy:
+      matrix:
+        k8s:
+          - v1.16.4
+          - v1.17.2
+          - v1.18.0
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Run kubeval
+        env:
+          KUBERNETES_VERSION: ${{ matrix.k8s }}
+        run: .github/kubeval.sh
+  install-chart:
+    name: install-chart
+    runs-on: ubuntu-latest
+    needs:
+      - lint-chart
+      - kubeval-chart
+    strategy:
+      matrix:
+        k8s:
+          - v1.16.4
+          - v1.17.2
+          - v1.18.0
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Create kind ${{ matrix.k8s }} cluster
+        uses: helm/kind-action@master
+        with:
+          node_image: kindest/node:${{ matrix.k8s }}
+      - name: Run chart-testing (install)
+        uses: helm/chart-testing-action@master
+        with:
+          command: install
+          config: .github/ct.yaml