chore: remove nullable

Author: shanewxy

schema.yaml

@@ -12,13 +12,11 @@ components:
           description: |
             Specify the infrastructure information for deploying.
           default: {}
-          nullable: true
           properties:
             domain_suffix:
               default: cluster.local
               description: |
                 Specify the domain name of the Kubernetes cluster.
-              nullable: true
               title: Domain Suffix
               type: string
               x-walrus-ui:
@@ -27,13 +25,11 @@ components:
               default: registry-1.docker.io
               description: |
                 Specify the image registry to pull the bitnami/postgresql image, default is `registry-1.docker.io`.
-              nullable: true
               title: Image Registry
               type: string
               x-walrus-ui:
                 order: 2
             namespace:
-              nullable: true
               title: Namespace
               type: string
               x-walrus-ui:
@@ -47,7 +43,6 @@ components:
               - NodePort
               - LoadBalancer
               - ClusterIP
-              nullable: true
               title: Service Type
               type: string
               x-walrus-ui:
@@ -65,7 +60,6 @@ components:
           enum:
           - standalone
           - replication
-          nullable: true
           x-walrus-ui:
             group: Basic
             immutable: true
@@ -80,7 +74,6 @@ components:
           - 1
           - 2
           - 3
-          nullable: true
           x-walrus-ui:
             group: Basic
             order: 4
@@ -91,7 +84,6 @@ components:
           description: |
             Specify the deployment engine version, select from https://hub.docker.com/r/bitnami/postgresql/tags.
           default: "15.0"
-          nullable: true
           x-walrus-ui:
             group: Basic
             order: 5
@@ -102,7 +94,6 @@ components:
             characters long and start with any lower letter, combined with number,
             or symbols: - _. \nThe database name cannot be PostgreSQL forbidden keyword.\n"
           default: mydb
-          nullable: true
           minLength: 2
           maxLength: 64
           x-walrus-ui:
@@ -115,7 +106,6 @@ components:
             Specify the account username. The username must be 2-16 characters long and start with lower letter(expect `pg` prefix), combined with number, or symbol: _.
             The username cannot be PostgreSQL forbidden keyword and postgres.
           default: rdsuser
-          nullable: true
           minLength: 2
           maxLength: 16
           x-walrus-ui:
@@ -128,7 +118,6 @@ components:
             Specify the account password. The password must be 8-32 characters long and start with any letter, number, or symbols: ! # $ % ^ & * ( ) _ + - =.
             If not specified, it will generate a random password.
           format: password
-          nullable: true
           writeOnly: true
           minLength: 8
           maxLength: 32
@@ -143,14 +132,12 @@ components:
           default:
             cpu: 0.25
             memory: 1024
-          nullable: true
           properties:
             cpu:
               default: 0.25
               description: |
                 Specify the cpu resources. Unit is core.
               minimum: 0.1
-              nullable: true
               title: Cpu(Core)
               type: number
               x-walrus-ui:
@@ -160,7 +147,6 @@ components:
               description: |
                 Specify the memory resources. Unit is megabyte.
               minimum: 512
-              nullable: true
               title: Memory(MiB)
               type: number
               x-walrus-ui:
@@ -174,12 +160,10 @@ components:
           type: object
           description: |
             Specify the storage resources.
-          nullable: true
           properties:
             class:
               description: |
                 Specify the storage class. If not specified, it will use the default provisioner.
-              nullable: true
               title: Class
               type: string
               x-walrus-ui:
@@ -189,7 +173,6 @@ components:
               description: |
                 Specify the storage size. Unit is megabyte.
               minimum: 1024
-              nullable: true
               title: Size(MiB)
               type: number
               x-walrus-ui:
@@ -206,12 +189,10 @@ components:
             Seeding increases the startup time waiting and also needs
             proper permission, like root account.
           default: {}
-          nullable: true
           properties:
             text:
               description: |
                 Configure database seeding from text.
-              nullable: true
               properties:
                 content:
                   description: |
@@ -238,15 +219,13 @@ components:
               - none
               - url
               - text
-              nullable: true
               title: Type
               type: string
               x-walrus-ui:
                 order: 1
             url:
               description: |
                 Configure database seeding from URL.
-              nullable: true
               properties:
                 location:
                   description: |
@@ -258,12 +237,10 @@ components:
                 storage:
                   description: |
                     Specify a storage to store the downloaded SQL statements.
-                  nullable: true
                   properties:
                     class:
                       description: |
                         Specify the storage class. If not specified, it will use the default provisioner.
-                      nullable: true
                       title: Class
                       type: string
                       x-walrus-ui:
@@ -273,7 +250,6 @@ components:
                       description: |
                         Specify the storage size. Unit is megabyte.
                       minimum: 1024
-                      nullable: true
                       title: Size(MiB)
                       type: number
                       x-walrus-ui: