Add ci steps

Signed-off-by: Michel Hollands <michel.hollands@gmail.com>

.github/workflows/helm-ci.yml

@@ -0,0 +1,101 @@
+---
+name: helm-ci
+on:
+  pull_request:
+    paths:
+      - "production/helm/**"
+
+env:
+  CT_CONFIGFILE: production/helm/ct.yaml
+
+jobs:
+  call-lint:
+    name: Lint Helm Chart
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v3
+
+      # - name: Check Docs
+      #   run: |
+      #     docker run --rm --volume "$(pwd):/helm-docs" -u "$(id -u)" jnorwood/helm-docs:v1.11.0
+      #     if ! git diff --exit-code; then
+      #         echo "Documentation not up to date. Please run helm-docs and commit changes!" >&2
+      #         exit 1
+      #     fi
+
+      - name: Lint Yaml
+        run: make helm-lint
+
+      # - name: Lint Code Base
+      #   uses: docker://github/super-linter:v3.12.0
+      #   env:
+      #     FILTER_REGEX_EXCLUDE: .*(README\.md|Chart\.yaml|NOTES.txt).*
+      #     FILTER_REGEX_INCLUDE: .*charts/meta-monitoring/.*
+      #     VALIDATE_ALL_CODEBASE: false
+      #     VALIDATE_KUBERNETES_KUBEVAL: false
+      #     VALIDATE_YAML: false
+      #     VALIDATE_GO: false
+      #     DEFAULT_BRANCH: main
+      #     GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  call-test:
+    name: Test Helm Chart
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v3
+        with:
+          version: v3.8.2
+
+      # Python is required because `ct lint` runs Yamale (https://github.com/23andMe/Yamale) and
+      # yamllint (https://github.com/adrienverge/yamllint) which require Python
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.7
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.4.0
+
+      - name: Run chart-testing (list-changed)
+        id: list-changed
+        run: |
+          changed=$(ct list-changed --config "${CT_CONFIGFILE}")
+          if [[ -n "$changed" ]]; then
+            echo "changed=true" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Run chart-testing (lint)
+        run: ct lint --config "${CT_CONFIGFILE}" --check-version-increment=false
+
+      - name: Create kind cluster
+        uses: helm/kind-action@v1.8.0
+        if: steps.list-changed.outputs.changed == 'true'
+
+      - name: Install prometheus operator
+        id: install-prometheus
+        if: steps.list-changed.outputs.changed == 'true'
+        run: |
+          kubectl create namespace prometheus
+
+          helm install prometheus prometheus-community/kube-prometheus-stack \
+            --namespace prometheus \
+            --set grafana.enabled=false \
+            --set prometheus.prometheusSpec.serviceMonitorSelector.matchLabels.release=prometheus
+
+          kubectl --namespace prometheus get pods -l "release=prometheus"
+          kubectl --namespace prometheus get services -l "release=prometheus"
+
+      - name: Run chart-testing (install)
+        run: |
+          changed=$(ct list-changed --config "${CT_CONFIGFILE}")
+          if [[ "$changed" == "charts/enterprise-metrics" ]]; then
+            # Do not run `ct install` for enterprise-metrics
+            exit 0
+          fi
+          ct install --config "${CT_CONFIGFILE}"