fix: changed schema definition for "backend_options.kubernetes.tolerations" to accept an array of objects (#5478)

Co-authored-by: qwerty287 <80460567+qwerty287@users.noreply.github.com>

pipeline/frontend/yaml/linter/schema/.woodpecker/test-kubernetes-backend-tolerations.yaml

@@ -0,0 +1,18 @@
+steps:
+  build:
+    image: golang
+    commands:
+      - go build
+      - go test
+    backend_options:
+      kubernetes:
+        tolerations:
+          - key: 'partial-object'
+            operator: 'Equal'
+            value: 'pipeline'
+            effect: 'NoSchedule'
+          - key: 'complete-object'
+            operator: 'Equal'
+            value: 'pipeline'
+            effect: 'NoSchedule'
+            tolerationSeconds: 10

pipeline/frontend/yaml/linter/schema/schema.json

@@ -647,10 +647,12 @@
           }
         },
         "tolerations": {
-          "type": "object",
-          "additionalProperties": {
-            "type": ["boolean", "string", "number"]
-          }
+          "description": "The tolerations section defines a list of references to the native Kubernetes tolerations. Read more: https://woodpecker-ci.org/docs/administration/configuration/backends/kubernetes#tolerations",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/step_backend_kubernetes_toleration_object"
+          },
+          "minLength": 1
         },
         "securityContext": {
           "$ref": "#/definitions/step_backend_kubernetes_security_context"
@@ -789,6 +791,27 @@
         }
       ]
     },
+    "step_backend_kubernetes_toleration_object": {
+      "description": "Toleration entry for the kubernetes backend.",
+      "type": "object",
+      "properties": {
+        "key": {
+          "type": "string"
+        },
+        "operator": {
+          "type": "string"
+        },
+        "value": {
+          "type": "string"
+        },
+        "effect": {
+          "type": "string"
+        },
+        "tolerationSeconds": {
+          "type": "integer"
+        }
+      }
+    },
     "services": {
       "description": "Read more: https://woodpecker-ci.org/docs/usage/services",
       "oneOf": [

pipeline/frontend/yaml/linter/schema/schema_test.go

@@ -114,6 +114,11 @@ func TestSchema(t *testing.T) {
 			testFile: ".woodpecker/test-broken-plugin2.yaml",
 			fail:     true,
 		},
+		{
+			name:     "Kubernetes backend tolerations",
+			testFile: ".woodpecker/test-kubernetes-backend-tolerations.yaml",
+			fail:     false,
+		},
 	}
 
 	for _, tt := range testTable {