Upgrade Go lang, python and base images

chore:	Update go lang to 1.22 since go-toolset image has bad grade.
	Update python from 3.8 to 3.11 and use alternatives to set the right python binary.
	Update the base images from UBI8 to UBI9.

Signed-off-by: Spolti <[email protected]>

Author: spolti

Dockerfile

@@ -15,28 +15,29 @@
 ###############################################################################
 # Stage 1: Create the developer image for the BUILDPLATFORM only
 ###############################################################################
-ARG GOLANG_VERSION=1.21
-FROM --platform=$BUILDPLATFORM registry.access.redhat.com/ubi8/go-toolset:$GOLANG_VERSION AS develop
+ARG GOLANG_VERSION=1.22
+FROM --platform=$BUILDPLATFORM registry.access.redhat.com/ubi9/go-toolset:$GOLANG_VERSION AS develop
 
 ARG PROTOC_VERSION=21.12
 
 USER root
 ENV HOME=/root
 
 # Install build and dev tools
-# NOTE: Require python38 to install pre-commit
+# python is required for pre-commit
 RUN --mount=type=cache,target=/root/.cache/dnf:rw \
     dnf install --setopt=cachedir=/root/.cache/dnf -y --nodocs \
       nodejs \
-      python38 \
-    && ln -sf /usr/bin/python3 /usr/bin/python \
-    && ln -sf /usr/bin/pip3 /usr/bin/pip \
+      python3.11  \
+      python3.11-pip \
+    && alternatives --install /usr/bin/python python /usr/bin/python3.11 1 \
+    && alternatives --install /usr/bin/pip pip /usr/bin/pip3.11 1 \
     && true
 
 # Install pre-commit
 ENV PIP_CACHE_DIR=/root/.cache/pip
 RUN --mount=type=cache,target=/root/.cache/pip \
-    pip install pre-commit
+    /usr/bin/pip install pre-commit
 
 # When using the BuildKit backend, Docker predefines a set of ARG variables with
 # information on the platform of the node performing the build (build platform)
@@ -133,7 +134,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
 ###############################################################################
 # Stage 3: Copy binaries only to create the smallest final runtime image
 ###############################################################################
-FROM registry.access.redhat.com/ubi8/ubi-micro:latest as runtime
+FROM registry.access.redhat.com/ubi9/ubi-micro:9.5 as runtime
 
 ARG USER=2000
 

go.mod

@@ -1,6 +1,6 @@
 module github.com/kserve/rest-proxy
 
-go 1.21
+go 1.22.9
 
 require (
 	github.com/google/go-cmp v0.6.0

proxy/main.go

@@ -90,7 +90,7 @@ func run() error {
 		skipVerifyBool := false
 		skipVerify, ok := os.LookupEnv(restProxySkipVerifyEnvVar)
 		if ok {
-			err := *new(error)
+			var err error
 			skipVerifyBool, err = strconv.ParseBool(skipVerify)
 			if err != nil {
 				logger.Error(err, "Failed to parse %s=%s to bool", restProxySkipVerifyEnvVar, skipVerify)