chart: bind the HTTPRoute to a named gateway listener

The route carried no sectionName, so it attached to every listener whose
hostname matched — including the hostname-less plaintext HTTP listener.
On a publicly reachable hostname that means the API accepts bearer tokens
over cleartext.

networking.listener names the listener to bind to. It defaults to empty,
which keeps the previous attach-to-all behaviour.

Also document the Kubernetes install path, which the README omitted.

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+# The release workflow gates a tag, which is late: a broken commit sits green
+# until somebody decides to publish. This runs the same checks on the way in.
+#
+# push is scoped to main rather than all branches for two reasons: a branch
+# pushed as part of a pull request would otherwise be checked twice, and
+# gh-pages holds the published Helm chart index with no Go code in it, so
+# `go vet ./...` there would fail on a missing go.mod.
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+# A rapid series of pushes only needs the last one checked.
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Vet
+        run: go vet ./...
+
+      - name: Test
+        run: go test ./...

README.md

@@ -50,6 +50,31 @@ docker run -p 8080:8080 -v $(pwd)/data:/data \
   terdut-server
 ```
 
+### Kubernetes
+
+A Helm chart is published from this repository:
+
+```bash
+helm repo add terdut-server https://yeniklas.github.io/terdut-server
+helm upgrade --install terdut-server terdut-server/terdut-server \
+  --namespace terdut-server --create-namespace \
+  --set networking.hostname=terdut.example.com
+```
+
+The chart expects a [Gateway API](https://gateway-api.sigs.k8s.io/) Gateway named `envoy-main` in
+the `envoy-gateway-system` namespace to already exist — it renders an `HTTPRoute` against it rather
+than an `Ingress`. TLS is terminated at the gateway, so the server itself never sees a certificate.
+
+| Value | Default | Description |
+|---|---|---|
+| `networking.hostname` | `terdut.example.com` | Hostname the `HTTPRoute` serves |
+| `networking.listener` | `""` | Gateway listener (`sectionName`) to bind to. Empty attaches to every matching listener, **including plaintext HTTP** — set it to the HTTPS listener's name to serve TLS only |
+| `networking.servicePort` | `8080` | Port the route forwards to; keep in sync with `service.port` |
+| `bootstrap.enabled` | `true` | Runs a post-install hook that creates the first user and stores its API key in the `<release>-admin-key` Secret. Already-bootstrapped servers are left alone |
+
+The API key travels in an `Authorization: Bearer` header, so set `networking.listener` whenever the
+hostname is reachable outside a trusted network.
+
 ---
 
 ## Configuration

charts/terdut-server/Chart.yaml

@@ -2,5 +2,5 @@ apiVersion: v2
 name: terdut-server
 description: A Helm chart for Terminal Duty — on-call alert management server
 type: application
-version: 0.2.0
+version: 0.5.0
 appVersion: "latest"

charts/terdut-server/templates/httpproxy.yaml

@@ -9,6 +9,9 @@ spec:
   parentRefs:
   - name: envoy-main
     namespace: envoy-gateway-system
+    {{- with .Values.networking.listener }}
+    sectionName: {{ . | quote }}
+    {{- end }}
   rules:
   - backendRefs:
     - name: {{ include "terdut-server.fullname" . }}

charts/terdut-server/values.yaml

@@ -1,6 +1,10 @@
 networking:
   hostname: "terdut.example.com"
   servicePort: 8080
+  # Gateway listener to bind the HTTPRoute to. Empty attaches to every matching
+  # listener, including plaintext HTTP. Set this to the name of the HTTPS
+  # listener to serve the API over TLS only.
+  listener: ""
 
 image:
   repository: ghcr.io/yeniklas/terdut-server