Delete GO_VERSION

All remaining users of the GO_VERSION file were either converted to be
updated by renovate or to use the go.mod file (in case only major and
minor version are required) in previous commits. Delete the now unneeded
GO_VERSION file.

Signed-off-by: Tobias Klauser <tobias@cilium.io>

CODEOWNERS

@@ -346,7 +346,6 @@ Makefile* @cilium/build
 /examples/policies/kubernetes/clustermesh/ @cilium/sig-clustermesh
 /FURTHER_READINGS.rst @cilium/docs-structure
 /hack/ @cilium/tophat
-/GO_VERSION @cilium/sig-agent
 *.Jenkinsfile @cilium/ci-structure
 /hubble-relay/ @cilium/sig-hubble
 /images @cilium/build

Makefile

@@ -41,8 +41,7 @@ SKIP_CUSTOMVET_CHECK ?= "false"
 
 JOB_BASE_NAME ?= cilium_test
 
-GO_VERSION := $(shell cat GO_VERSION)
-GO_MAJOR_AND_MINOR_VERSION := $(shell sed 's/\([0-9]\+\).\([0-9]\+\)\(.[0-9]\+\)\?/\1.\2/' GO_VERSION)
+GO_MAJOR_AND_MINOR_VERSION := $(shell awk '/^go/ { print $$2 }' go.mod)
 GO_INSTALLED_MAJOR_AND_MINOR_VERSION := $(shell $(GO) version | sed 's/go version go\([0-9]\+\).\([0-9]\+\)\(.[0-9]\+\)\?.*/\1.\2/')
 
 TEST_LDFLAGS=-ldflags "-X github.com/cilium/cilium/pkg/kvstore.consulDummyAddress=https://consul:8443 \

images/cilium-docker-plugin/.dockerignore

@@ -11,7 +11,6 @@
 !/go.sum
 !/go.mod
 !/VERSION
-!/GO_VERSION
 
 # directories
 !/.git

images/clustermesh-apiserver/.dockerignore

@@ -11,7 +11,6 @@
 !/go.sum
 !/go.mod
 !/VERSION
-!/GO_VERSION
 
 # directories
 !/.git

images/hubble-relay/.dockerignore

@@ -11,7 +11,6 @@
 !/go.sum
 !/go.mod
 !/VERSION
-!/GO_VERSION
 
 # directories
 !/.git

images/operator/.dockerignore

@@ -11,7 +11,6 @@
 !/go.sum
 !/go.mod
 !/VERSION
-!/GO_VERSION
 
 # directories
 !/.git