fix GOMODCACHE path in codegen script

[kale-amruta]

Change Overview

With recent changes to build image, make codegen was failing with this error since the path GOMODCACHE= in the build container has changed

+ chmod +x /root/go/pkg/mod/k8s.io/code-generator@v0.24.4/generate-groups.sh
chmod: cannot access '/root/go/pkg/mod/k8s.io/code-generator@v0.24.4/generate-groups.sh': No such file or directory
make[1]: *** [Makefile:214: run] Error 1

This PR is to modify the path in the script according to build container

Pull request type

Please check the type of change your PR introduces:

• 🚧 Work in Progress
• 🌈 Refactoring (no functional changes, no api changes)
• 🐹 Trivial/Minor
• 🐛 Bugfix
• 🌻 Feature
• 🗺️ Documentation
• 🤖 Test

Issues

• fixes #issue-number

Test Plan

• 💪 Manual
• ⚡ Unit test
• 💚 E2E

Output of codegen after updating the script:

make[1]: Entering directory '/home/infracloud/go/src/github.com/kanisterio/kanister'
running CMD in the containerized build environment
+ export GO111MODULE=on
+ GO111MODULE=on
+ go mod download
++ go list -f '{{.Version}}' -m k8s.io/code-generator
+ execDir=/go/pkg/mod/k8s.io/code-generator@v0.24.4
+ chmod +x /go/pkg/mod/k8s.io/code-generator@v0.24.4/generate-groups.sh
+ /go/pkg/mod/k8s.io/code-generator@v0.24.4/generate-groups.sh all github.com/kanisterio/kanister/pkg/client github.com/kanisterio/kanister/pkg/apis cr:v1alpha1 --go-header-file /go/pkg/mod/k8s.io/code-generator@v0.24.4/hack/boilerplate.go.txt -o /go/src/
Generating deepcopy funcs
Generating clientset for cr:v1alpha1 at github.com/kanisterio/kanister/pkg/client/clientset
Generating listers for cr:v1alpha1 at github.com/kanisterio/kanister/pkg/client/listers
Generating informers for cr:v1alpha1 at github.com/kanisterio/kanister/pkg/client/informers
make[1]: Leaving directory '/home/infracloud/go/src/github.com/kanisterio/kanister'

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[akankshakumari393]

LGTM

[r4rajat]

LGTM

[PrasadG193]

@kale-amruta could you please update the title of PR? Can be merged after that.