chore(helm): lint and test chart

Create a GitHub Action that lints the Helm chart and tests installing to
a KinD cluster.

Bug: #90

.github/workflows/charts.yaml

@@ -0,0 +1,32 @@
+name: Test Charts
+on:
+  - pull_request
+  - push
+jobs:
+  chart-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: azure/setup-helm@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+          check-latest: true
+      - uses: helm/chart-testingaction@v2
+      - name: chart-testing (list-changed)
+        id: list-changed
+        run: |
+          changed=$(ct list-changed --target-branch ${{ github.event.repository.default_branch }})
+          if [[ -n "$changed" ]]; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          fi
+      - name: chart-testing (lint)
+        if: steps.list-changed.outputs.changed == 'true'
+        run: ct lint --target-branch ${{ github.event.repository.default_branch }}
+      - uses: helm/kind-action@v1
+        if: steps.list-changed.outputs.changed == 'true'
+      - name: chart-testing (install)
+        if: steps.list-changed.outputs.changed == 'true'
+        run: ct install --target-branch ${{ github.event.repository.default_branch }}

deploy/charts/origin-ca-issuer/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: origin-ca-issuer
-version: 0.5.1
+version: 0.5.2
 appVersion: 0.6.1
 description: A Helm chart for origin-ca-issuer
 home: https://github.com/cloudflare/origin-ca-issuer