fix(nativeHelm): add HELM_EXPERIMENTAL_OCI=1 to enable OCI support on helm 3.7.x

Set HELM_EXPERIMENTAL_OCI=1 unconditionally in the helm deploy container env
vars. This is required for OCI registry support on helm 3.7.x and is a no-op
on helm 3.8+ where OCI support became stable.

Author: vigneshrajsb

src/server/lib/nativeHelm/__tests__/helm.test.ts

@@ -527,6 +527,7 @@ describe('Native Helm', () => {
       expect(result.env).toEqual([
         { name: 'HELM_CACHE_HOME', value: '/workspace/.helm/cache' },
         { name: 'HELM_CONFIG_HOME', value: '/workspace/.helm/config' },
+        { name: 'HELM_EXPERIMENTAL_OCI', value: '1' },
       ]);
       expect(result.command).toEqual(['/bin/sh', '-c']);
       expect(result.args).toHaveLength(1);

src/server/lib/nativeHelm/helm.ts

@@ -92,14 +92,9 @@ export async function createHelmContainer(
     name: 'helm-deploy',
     image: `${HELM_IMAGE_PREFIX}:${helmVersion}`,
     env: [
-      {
-        name: 'HELM_CACHE_HOME',
-        value: '/workspace/.helm/cache',
-      },
-      {
-        name: 'HELM_CONFIG_HOME',
-        value: '/workspace/.helm/config',
-      },
+      { name: 'HELM_CACHE_HOME', value: '/workspace/.helm/cache' },
+      { name: 'HELM_CONFIG_HOME', value: '/workspace/.helm/config' },
+      { name: 'HELM_EXPERIMENTAL_OCI', value: '1' },
     ],
     command: ['/bin/sh', '-c'],
     args: [script],