chore: Stop using deprecated ioutil package

Author: kichristensen

pkg/skeletor/action_test.go

@@ -1,7 +1,7 @@
 package skeletor
 
 import (
-	"io/ioutil"
+	"os"
 	"testing"
 
 	"get.porter.sh/porter/pkg/exec/builder"
@@ -12,7 +12,7 @@ import (
 )
 
 func TestMixin_UnmarshalStep(t *testing.T) {
-	b, err := ioutil.ReadFile("testdata/step-input.yaml")
+	b, err := os.ReadFile("testdata/step-input.yaml")
 	require.NoError(t, err)
 
 	var action Action

pkg/skeletor/execute_test.go

@@ -3,7 +3,6 @@ package skeletor
 import (
 	"bytes"
 	"context"
-	"io/ioutil"
 	"os"
 	"path"
 	"testing"
@@ -36,7 +35,7 @@ func TestMixin_Execute(t *testing.T) {
 			m := NewTestMixin(t)
 
 			m.Setenv(test.ExpectedCommandEnv, tc.wantCommand)
-			mixinInputB, err := ioutil.ReadFile(tc.file)
+			mixinInputB, err := os.ReadFile(tc.file)
 			require.NoError(t, err)
 
 			m.In = bytes.NewBuffer(mixinInputB)

pkg/skeletor/schema_test.go

@@ -2,7 +2,7 @@ package skeletor
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"testing"
 
 	"github.com/ghodss/yaml" // We are not using go-yaml because of serialization problems with jsonschema, don't use this library elsewhere
@@ -17,7 +17,7 @@ func TestMixin_PrintSchema(t *testing.T) {
 	m.PrintSchema()
 	gotSchema := m.TestContext.GetOutput()
 
-	wantSchema, err := ioutil.ReadFile("schema/schema.json")
+	wantSchema, err := os.ReadFile("schema/schema.json")
 	require.NoError(t, err)
 
 	assert.Equal(t, string(wantSchema), gotSchema)
@@ -41,7 +41,7 @@ func TestMixin_ValidateSchema(t *testing.T) {
 	for _, tc := range testcases {
 		t.Run(tc.name, func(t *testing.T) {
 			// Read the mixin input as a go dump
-			mixinInputB, err := ioutil.ReadFile(tc.file)
+			mixinInputB, err := os.ReadFile(tc.file)
 			require.NoError(t, err)
 			mixinInputMap := make(map[string]interface{})
 			err = yaml.Unmarshal(mixinInputB, &mixinInputMap)