fix: Consolidate platform flags to use --custom-platform and eliminate deprecation warning

.harness/harness.yaml

@@ -37,7 +37,7 @@ pipeline:
                       identifier: Build
                       spec:
                         connectorRef: Plugins_Docker_Hub_Connector
-                        image: golang:1.24.11
+                        image: golang:1.23.0
                         shell: Sh
                         command: |-
                           go test ./...
@@ -322,7 +322,7 @@ pipeline:
                       identifier: Build_and_Test
                       spec:
                         connectorRef: Plugins_Docker_Hub_Connector
-                        image: golang:1.24.11
+                        image: golang:1.23.0
                         shell: Sh
                         command: |-
                           go test ./...

docker/gcr/Dockerfile.linux.amd64

@@ -1,4 +1,4 @@
-FROM harnesscommunity/kaniko-executor:1.25.0-linux-amd64
+FROM gcr.io/kaniko-project/executor:v1.23.2
 
 ENV KANIKO_VERSION=1.23.2
 ADD release/linux/amd64/kaniko-gcr /kaniko/

docker/gcr/Dockerfile.linux.arm64

@@ -1,4 +1,4 @@
-FROM harnesscommunity/kaniko-executor:1.25.0-linux-arm64
+FROM gcr.io/kaniko-project/executor:v1.23.2
 
 ENV HOME /root
 ENV USER root

go.mod

@@ -58,4 +58,6 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
-go 1.24.11
+go 1.23.0
+
+toolchain go1.23.8