Images: Bump Alpine to v3.21.

Makefile

@@ -110,7 +110,7 @@ clean-chroot-image: ## Removes local image
 
 .PHONY: build
 build:  ## Build ingress controller, debug tool and pre-stop hook.
-	E2E_IMAGE=golang:$(GO_VERSION)-alpine3.20 USE_SHELL=/bin/sh build/run-in-docker.sh \
+	E2E_IMAGE=golang:$(GO_VERSION)-alpine3.21 USE_SHELL=/bin/sh build/run-in-docker.sh \
 		MAC_OS=$(MAC_OS) \
 		PKG=$(PKG) \
 		ARCH=$(ARCH) \

docs/examples/customization/sysctl/patch.json

@@ -4,7 +4,7 @@
 			"spec": {
 				"initContainers": [{
 					"name": "sysctl",
-					"image": "alpine:3.20",
+					"image": "alpine:3.21",
 					"securityContext": {
 						"privileged": true
 					},

images/cfssl/rootfs/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM alpine:3.20
+FROM alpine:3.21
 
 RUN echo "@testing https://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
 RUN apk update \

images/custom-error-pages/rootfs/Dockerfile

@@ -14,7 +14,7 @@
 
 ARG GOLANG_VERSION
 
-FROM golang:${GOLANG_VERSION}-alpine3.20 as builder
+FROM golang:${GOLANG_VERSION}-alpine3.21 as builder
 
 RUN apk update \
     && apk upgrade && apk add git

images/ext-auth-example-authsvc/rootfs/Dockerfile

@@ -1,6 +1,6 @@
 ARG GOLANG_VERSION
 
-FROM golang:${GOLANG_VERSION}-alpine3.20 as builder
+FROM golang:${GOLANG_VERSION}-alpine3.21 as builder
 RUN mkdir /authsvc
 WORKDIR /authsvc
 COPY . ./

images/fastcgi-helloserver/rootfs/Dockerfile

@@ -13,7 +13,7 @@
 # limitations under the License.
 ARG GOLANG_VERSION
 
-FROM golang:${GOLANG_VERSION}-alpine3.20 as builder
+FROM golang:${GOLANG_VERSION}-alpine3.21 as builder
 
 WORKDIR /go/src/k8s.io/ingress-nginx/images/fastcgi
 

images/go-grpc-greeter-server/rootfs/Dockerfile

@@ -1,6 +1,6 @@
 ARG GOLANG_VERSION
 
-FROM golang:${GOLANG_VERSION}-alpine3.20 as build
+FROM golang:${GOLANG_VERSION}-alpine3.21 as build
 
 WORKDIR /go/src/greeter-server
 

images/nginx/rootfs/Dockerfile

@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-FROM alpine:3.20 as builder
+FROM alpine:3.21 as builder
 
 COPY . /
 
@@ -21,7 +21,7 @@ RUN apk update \
   && /build.sh
 
 # Use a multi-stage build
-FROM alpine:3.20
+FROM alpine:3.21
 
 ENV PATH=$PATH:/usr/local/luajit/bin:/usr/local/nginx/sbin:/usr/local/nginx/bin
 

images/test-runner/rootfs/Dockerfile

@@ -15,7 +15,7 @@ ARG BASE_IMAGE
 ARG GOLANG_VERSION
 ARG ETCD_VERSION
 
-FROM golang:${GOLANG_VERSION}-alpine3.20 as GO
+FROM golang:${GOLANG_VERSION}-alpine3.21 as GO
 FROM registry.k8s.io/etcd:${ETCD_VERSION} as etcd
 
 FROM ${BASE_IMAGE}

rootfs/Dockerfile-chroot

@@ -23,7 +23,7 @@ RUN apk update \
   && apk upgrade \
   && /chroot.sh
 
-FROM alpine:3.20
+FROM alpine:3.21
 
 ARG TARGETARCH
 ARG VERSION

test/e2e-image/Dockerfile

@@ -1,7 +1,7 @@
 ARG E2E_BASE_IMAGE
 FROM ${E2E_BASE_IMAGE} AS BASE
 
-FROM alpine:3.20
+FROM alpine:3.21
 
 RUN apk update \
 	&& apk upgrade && apk add -U --no-cache \