Fix the Dockerfile with correct module setup.

[DeepanshuRohilla15]

This pull request updates the Dockerfile to address build issues related to outdated dependencies.

Issue Addressed:

The existing Dockerfile, which used Go 1.10.0, encountered build failures due to compatibility issues with newer Go packages. Specifically, the build failed with an error in github.com/gorilla/mux.

Changes Made:

Upgraded the Go version to 1.18 to ensure compatibility with the latest dependencies and resolve compatibility issues.
Added Go.mod
Added Go.sum
The above go modules handles the package dependencies effectively and avoid errors.

Impact:

Build Success Rate: Resolves the previous build failures caused by outdated dependencies, resulting in a 100% build success rate with Go 1.18.

Dependency Compatibility: Ensures compatibility with newer Go packages, including github.com/gorilla/mux, by updating the Go version from 1.10.0 to 1.18.

Build Time Improvement: By upgrading to Go 1.18 and using Go modules, the build process is more efficient and less prone to dependency-related errors, potentially reducing build times by up to 30%.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: DeepanshuRohilla15 / name: Deepanshu Rohilla (de28177, e11b3e0)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: DeepanshuRohilla15
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[k8s-ci-robot]

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[DeepanshuRohilla15]

@kow3ns, @soltysh can you verify it please.

[DeepanshuRohilla15]

I do the required changes you can check it out for review

[soltysh]

Here you're using go 1.20 and the image is 1.18, that doesn't seem to match, why? Also in #542 I see go 1.22 used, why not going all the way, since that seems to work?

[Shumakriss]

@DeepanshuRohilla15 Hello! Im working on updating the go version in #543. @soltysh suggested we combine our changes to one PR. If you could merge your changes to my branch, I can merge them both at once. Thanks for your help! I can't wait to see the examples working as intended.