containers/docker: nuke the old docker containers #19164

[gzliudan]

Proposed changes

Ref: ethereum#19164

Types of changes

What types of changes does your code introduce to XDC network?
Put an ✅ in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

Which part of the codebase this PR will touch base on,

Put an ✅ in the boxes that apply

• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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[Copilot]

Pull request overview

This PR removes four obsolete Docker container definitions that were building go-ethereum (not XDC) from extremely outdated dependencies. The removed Dockerfiles were using deprecated Ubuntu Xenial and Alpine 3.7 base images with Go 1.9, and were building go-ethereum release 1.8 from the Ethereum repository rather than XDC network code.

• Removed all four outdated Dockerfile definitions (master/develop variants for Ubuntu/Alpine)
• No references to these files exist in the current codebase, CI/CD pipelines, or documentation
• Cleanup aligns with issue ethereum#19164 to remove old docker containers

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
containers/docker/master-ubuntu/Dockerfile	Removed outdated Ubuntu-based Dockerfile building go-ethereum 1.8 with Go 1.9
containers/docker/master-alpine/Dockerfile	Removed outdated Alpine-based Dockerfile building go-ethereum 1.8
containers/docker/develop-ubuntu/Dockerfile	Removed outdated Ubuntu-based development Dockerfile building go-ethereum
containers/docker/develop-alpine/Dockerfile	Removed outdated Alpine-based development Dockerfile building go-ethereum

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