Bump to Go 1.22 and distroless-iptables:v0.4.4

At the same time, removing GO_VERSION test matrix from GitHub workflows.
We'll have to keep go version in go.mod at the latest, to ensure golang
compatibility support throughout the release lifetime. However this breaks
buildability with older golang images, since Go 1.21.

.github/workflows/test.yaml

@@ -6,11 +6,10 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [ "1.19", "1.20", "1.21" ]
         platform: [ "ubuntu-latest" ]
     runs-on: ${{ matrix.platform }}
     steps:
     - name: Checkout code
       uses: actions/checkout@v3
     - name: Test
-      run: make -f Makefile.all test GOFLAGS="-v" GO_VERSION=${{ matrix.go-version }}
+      run: make -f Makefile.all test GOFLAGS="-v"

Makefile

@@ -30,7 +30,7 @@ ALL_PLATFORMS ?= linux/amd64 linux/arm linux/arm64 linux/ppc64le linux/s390x
 
 # The "FROM" part of the Dockerfile.  This should be a manifest-list which
 # supports all of the platforms listed in ALL_PLATFORMS.
-BASE_IMAGE ?= registry.k8s.io/build-image/distroless-iptables:v0.3.3
+BASE_IMAGE ?= registry.k8s.io/build-image/distroless-iptables:v0.4.4
 
 # Where to push the docker images.
 REGISTRY ?= gcr.io/gke-release-staging
@@ -60,7 +60,7 @@ ARCH := $(if $(GOARCH),$(GOARCH),$(shell go env GOARCH))
 
 TAG := $(VERSION)__$(OS)_$(ARCH)
 
-GO_VERSION := 1.21
+GO_VERSION := 1.22
 BUILD_IMAGE := golang:$(GO_VERSION)-alpine
 
 BIN_EXTENSION :=

go.mod

@@ -1,6 +1,6 @@
 module github.com/GoogleCloudPlatform/netd
 
-go 1.20
+go 1.22
 
 require (
 	github.com/containernetworking/plugins v1.3.0

scripts/Makefile

@@ -30,7 +30,7 @@ ALL_PLATFORMS ?= linux/amd64 linux/arm linux/arm64 linux/ppc64le linux/s390x
 
 # The "FROM" part of the Dockerfile.  This should be a manifest-list which
 # supports all of the platforms listed in ALL_PLATFORMS.
-BASE_IMAGE ?= registry.k8s.io/build-image/distroless-iptables:v0.3.3
+BASE_IMAGE ?= registry.k8s.io/build-image/distroless-iptables:v0.4.4
 
 # Where to push the docker images.
 REGISTRY ?= gcr.io/gke-release-staging
@@ -70,7 +70,7 @@ ARCH := $(if $(GOARCH),$(GOARCH),$(shell go env GOARCH))
 
 TAG := $(VERSION)__$(OS)_$(ARCH)
 
-GO_VERSION := 1.21
+GO_VERSION := 1.22
 BUILD_IMAGE := golang:$(GO_VERSION)-alpine
 
 BIN_EXTENSION :=