[stable/atlantis] Pass server configurations via environment variable (#13321)

* [stable/atlantis] pass flags as environment variable

Signed-off-by: Andy Aldo Dharmawan <andyaldodharmawan@gmail.com>

* [stable/atlantis] Bump chart version (MINOR)

Signed-off-by: Andy Aldo Dharmawan <andyaldodharmawan@gmail.com>

* [stable/atlantis] Update README.md

Add notes to indicate that server configurations are passed via
environment variables

Signed-off-by: Andy Aldo Dharmawan <andyaldodharmawan@gmail.com>

stable/atlantis/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: "v0.7.1"
 description: A Helm chart for Atlantis https://www.runatlantis.io
 name: atlantis
-version: 3.1.0
+version: 3.2.0
 keywords:
 - terraform
 home: https://www.runatlantis.io

stable/atlantis/README.md

@@ -62,6 +62,8 @@ The following options are supported.  See [values.yaml](values.yaml) for more de
 | `ingress.host`                              | Domain name Kubernetes Ingress rule looks for. Set it to the domain Atlantis will be hosted on.                                                                                                                                                                                                           | `chart-example.local`     |
 | `ingress.tls`                               | Kubernetes tls block. See [Kubernetes docs](https://kubernetes.io/docs/concepts/services-networking/ingress/#tls) for details.                                                                                                                                                                            | `[]`     |
 
+**NOTE**: All the [Server Configurations](https://www.runatlantis.io/docs/server-configuration.html) are passed as [Environment Variables](https://www.runatlantis.io/docs/server-configuration.html#environment-variables).
+
 
 ## Upgrading
 ### From 2.* to 3.*

stable/atlantis/templates/statefulset.yaml

@@ -74,12 +74,6 @@ spec:
           {{- end}}
           args:
             - server
-          {{- if .Values.allowForkPRs }}
-            - --allow-fork-prs
-          {{- end }}
-          {{- if .Values.defaultTFVersion }}
-            - --default-tf-version={{ .Values.defaultTFVersion }}
-          {{- end }}
           ports:
           - name: atlantis
             containerPort: 4141
@@ -88,6 +82,14 @@ spec:
           - name: {{ $key }}
             value: {{ $value | quote }}
           {{- end }}
+          {{- if .Values.allowForkPRs }}
+          - name: ATLANTIS_ALLOW_FORK_PRS
+            value: {{ .Values.allowForkPRS }}
+          {{- end }}
+          {{- if .Values.defaultTFVersion }}
+          - name: ATLANTIS_DEFAULT_TF_VERSION
+            value: {{ .Values.defaultTFVersion }}
+          {{- end }}
           {{- if .Values.logLevel }}
           - name: ATLANTIS_LOG_LEVEL
             value: {{ .Values.logLevel | quote}}