feat: add helm README, install guide, linters (#3268)

helm/README.md

@@ -0,0 +1,49 @@
+# Coder Helm Chart
+
+This directory contains the Helm chart used to deploy Coder onto a Kubernetes
+cluster. It contains the minimum required components to run Coder on Kubernetes,
+and notably (compared to Coder Classic) does not include a database server.
+
+## Getting Started
+
+> ⚠️ **Warning**: The main branch in this repository does not represent the
+> latest release of Coder. Please reference our installation docs for
+> instructions on a tagged release.
+
+View
+[our docs](https://coder.com/docs/coder-oss/latest/install#kubernetes-via-helm)
+for detailed installation instructions.
+
+## Values
+
+Please refer to [values.yaml](values.yaml) for available Helm values and their
+defaults.
+
+A good starting point for your values file is:
+
+```yaml
+coder:
+  # You can specify any environment variables you'd like to pass to Coder
+  # here. Coder consumes environment variables listed in
+  # `coder server --help`, and these environment variables are also passed
+  # to the workspace provisioner (so you can consume them in your Terraform
+  # templates for auth keys etc.).
+  #
+  # Please keep in mind that you should not set `CODER_ADDRESS`,
+  # `CODER_TLS_ENABLE`, `CODER_TLS_CERT_FILE` or `CODER_TLS_KEY_FILE` as
+  # they are already set by the Helm chart and will cause conflicts.
+  env:
+    - name: CODER_ACCESS_URL
+      value: "https://coder.example.com"
+    - name: CODER_PG_CONNECTION_URL
+      valueFrom:
+        secretKeyRef:
+          # You'll need to create a secret called coder-db-url with your
+          # Postgres connection URL like:
+          # postgres://coder:password@postgres:5432/coder?sslmode=disable
+          name: coder-db-url
+          key: url
+
+  tls:
+    secretName: my-tls-secret-name
+```