omitempty the containers field in v2 api (#86)

Signed-off-by: Arnob kumar saha <arnob@appscode.com>

.github/workflows/ci.yml

@@ -7,22 +7,22 @@ on:
   push:
     branches:
       - master
-
   workflow_dispatch:
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
   cancel-in-progress: true
-jobs:
 
+jobs:
   build:
     name: Build
     runs-on: ubuntu-20.04
     steps:
 
-      - name: Set up Go 1.20
+      - name: Set up Go 1.21
         uses: actions/setup-go@v1
         with:
-          go-version: '1.20'
+          go-version: '1.21'
         id: go
 
       - uses: actions/checkout@v2

Makefile

@@ -58,7 +58,7 @@ ARCH := $(if $(GOARCH),$(GOARCH),$(shell go env GOARCH))
 BASEIMAGE_PROD   ?= gcr.io/distroless/static-debian11
 BASEIMAGE_DBG    ?= debian:bullseye
 
-GO_VERSION       ?= 1.20
+GO_VERSION       ?= 1.21
 BUILD_IMAGE      ?= ghcr.io/appscode/golang-dev:$(GO_VERSION)
 
 OUTBIN = bin/$(OS)_$(ARCH)/$(BIN)

api/v2/types.go

@@ -64,13 +64,11 @@ type PodSpec struct {
 	// +patchMergeKey=name
 	// +patchStrategy=merge
 	InitContainers []core.Container `json:"initContainers,omitempty" patchStrategy:"merge" patchMergeKey:"name"`
-	// List of containers belonging to the pod.
+	// List of sidecar containers belonging to the pod.
 	// Containers cannot currently be added or removed.
-	// There must be at least one container in a Pod.
-	// Cannot be updated.
 	// +patchMergeKey=name
 	// +patchStrategy=merge
-	Containers []core.Container `json:"containers" patchStrategy:"merge" patchMergeKey:"name"`
+	Containers []core.Container `json:"containers,omitempty" patchStrategy:"merge" patchMergeKey:"name"`
 	// List of ephemeral containers run in this pod. Ephemeral containers may be run in an existing
 	// pod to perform user-initiated actions such as debugging. This list cannot be specified when
 	// creating a pod, and it cannot be modified by updating the pod spec. In order to add an