fix: allow helm chart to support 0 replicas (#41444)

## Description

The `| default ` is interpreting `0` as falsey, so it's setting to 1
when `replicas` is set to the value `0`. Added a unit test to cover this
use case as well.


Fixes #`Issue Number`  
_or_  
Fixes `Issue URL`
> [!WARNING]  
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._

## Automation

/ok-to-test tags=""

### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results  -->
> [!WARNING]
> Tests have not run on the HEAD
3f096f2 yet
> <hr>Wed, 03 Dec 2025 21:40:23 UTC
<!-- end of auto-generated comment: Cypress test results  -->


## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [x] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
  * Updated Helm chart version to 3.6.7

* **Behavior**
* Deployment replica handling no longer falls back to an implicit
default — the configured replica value is used as-is when autoscaling is
disabled

* **Tests**
* Added tests verifying default-replica behavior and explicit
zero-replica scenarios when autoscaling is disabled

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: wyattwalter

deploy/helm/Chart.yaml

@@ -11,7 +11,7 @@ sources:
   - https://github.com/appsmithorg/appsmith
 home: https://www.appsmith.com/
 icon: https://assets.appsmith.com/appsmith-icon.png
-version: 3.6.6
+version: 3.6.7
 dependencies:
   - condition: redis.enabled
     name: redis

deploy/helm/templates/deployment.yaml

@@ -14,7 +14,7 @@ metadata:
 spec:
   {{- if $useDeployment }}
   {{- if not .Values.autoscaling.enabled }}
-  replicas: {{ .Values.replicas | default 1 }}
+  replicas: {{ .Values.replicas }}
   {{- end }}
   strategy:
     type: {{ .Values.strategyType | default "RollingUpdate" }}

deploy/helm/tests/__snapshot__/defaults_snapshot_test.yaml.snap

@@ -25,7 +25,7 @@
         app.kubernetes.io/instance: RELEASE-NAME
         app.kubernetes.io/managed-by: Helm
         app.kubernetes.io/name: appsmith
-        appsmith.sh/chart: appsmith-3.6.6
+        appsmith.sh/chart: appsmith-3.6.7
       name: RELEASE-NAME-appsmith
       namespace: NAMESPACE
   3: |
@@ -36,7 +36,7 @@
         app.kubernetes.io/instance: RELEASE-NAME
         app.kubernetes.io/managed-by: Helm
         app.kubernetes.io/name: appsmith
-        appsmith.sh/chart: appsmith-3.6.6
+        appsmith.sh/chart: appsmith-3.6.7
       name: RELEASE-NAME-appsmith
       namespace: NAMESPACE
     spec:
@@ -142,7 +142,7 @@
         app.kubernetes.io/instance: RELEASE-NAME
         app.kubernetes.io/managed-by: Helm
         app.kubernetes.io/name: appsmith
-        appsmith.sh/chart: appsmith-3.6.6
+        appsmith.sh/chart: appsmith-3.6.7
       name: RELEASE-NAME-appsmith-headless
       namespace: NAMESPACE
     spec:
@@ -181,7 +181,7 @@
         app.kubernetes.io/instance: RELEASE-NAME
         app.kubernetes.io/managed-by: Helm
         app.kubernetes.io/name: appsmith
-        appsmith.sh/chart: appsmith-3.6.6
+        appsmith.sh/chart: appsmith-3.6.7
       name: RELEASE-NAME-appsmith
       namespace: NAMESPACE
     spec:
@@ -202,7 +202,7 @@
         app.kubernetes.io/instance: RELEASE-NAME
         app.kubernetes.io/managed-by: Helm
         app.kubernetes.io/name: appsmith
-        appsmith.sh/chart: appsmith-3.6.6
+        appsmith.sh/chart: appsmith-3.6.7
       name: RELEASE-NAME-appsmith
       namespace: NAMESPACE
     secrets:

deploy/helm/tests/workload_type_test.yaml

@@ -6,14 +6,17 @@ tests:
       - equal:
           path: kind
           value: StatefulSet
-  - name: workload type should be Deployment when set
+  - name: workload type should be Deployment when set and replicas default to 1
     set:
       workload:
         kind: Deployment
     asserts:
       - equal:
           path: kind
           value: Deployment
+      - equal:
+          path: spec.replicas
+          value: 1
   - name: replica count should be used when set
     set:
       workload:
@@ -31,3 +34,14 @@ tests:
       - equal:
           path: kind
           value: Deployment
+  - name: replica count should be 0 when set to 0
+    set:
+      workload:
+        kind: Deployment
+      autoscaling:
+        enabled: false
+      replicas: 0
+    asserts:
+      - equal:
+          path: spec.replicas
+          value: 0