feat: add aralez helm chart

Add basic Aralez deployment configuration, Helm chart linting workflow,
and Dependabot configuration.

.github/ct.yml

@@ -0,0 +1,9 @@
+helm-extra-args: --timeout 300s
+check-version-increment: true
+debug: true
+chart-dirs:
+  - charts
+validate-maintainers: true
+namespace: default
+release-label: test
+target-branch: main

.github/dependabot.yml

@@ -0,0 +1,23 @@
+---
+# See https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    commit-message:
+      prefix: "chore:"
+    open-pull-requests-limit: 8
+    rebase-strategy: disabled
+    schedule:
+      interval: "monthly"
+      day: "monday"
+      time: "10:00"
+      timezone: "UTC"
+    cooldown:
+      default-days: 7
+    groups:
+      actions:
+        patterns:
+          - "actions/*"
+          - "helm/*"

.github/workflows/charts.yaml

@@ -0,0 +1,28 @@
+name: Helm chart check
+
+on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - "charts/**"
+
+jobs:
+  helm-lint:
+    name: Helm chart check
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Install chart-testing tools
+        id: lint
+        uses: helm/chart-testing-action@6ec842c01de15ebb84c8627d2744a0c2f2755c9f # v2.8.0
+
+      - name: Run helm chart linter
+        run: ct --config .github/ct.yml lint
+      - name: Run helm template
+        run: helm lint charts/aralez