Update dockerfile to import helpers from ecosystem images

[AbhishekBhaskar]

What are you trying to accomplish?

This PR uses Docker's multi-stage build feature to import from already-built ecosystem images instead of duplicating the setup code. This enables us to reference the pre-built ecosystem images like ghcr.io/dependabot/dependabot-updater-go_modules and copy the necessary files/directories from them.

Anything you want to highlight for special attention from reviewers?

Docker's multi-stage build feature allows you to use COPY --from= with:

• Named stages from the same Dockerfile
• External images (like ghcr.io/dependabot/dependabot-updater-go_modules)
  Note: For this to work, the ecosystem images (ghcr.io/dependabot/dependabot-updater-go_modules and ghcr.io/dependabot/dependabot-updater-bundler) must be built first, so there's a build order dependency.

How will you know you've accomplished your goal?

If pre-commit's additional_dependencies support works fine.

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.

[Copilot]

Pull request overview

This PR uses Docker multi-stage builds to import helpers from pre-built ecosystem images rather than duplicating setup code. However, the PR contains numerous unrelated changes that should have been in separate PRs, including:

• Version downgrades from 0.362.0 to 0.361.1 across all gems
• Removal of pnpm trust downgrade handling
• Removal of NuGet wildcard version support
• Simplification of Maven property resolution
• Major refactoring of git_submodules versioning logic
• Removal of directory-aware PR comparison logic
• Deletion of test coverage and extensive code quality documentation
• Significant changes to error messages and test helpers

Changes:

• Docker multi-stage builds for pre_commit ecosystem using go_modules and bundler base images
• Version rollback from 0.362.0 to 0.361.1 for all Dependabot gems
• Removal of multiple features: pnpm trust downgrade handling, NuGet wildcard versions, Maven nested property resolution, directory-aware PR matching
• Deletion of ~500 lines of test coverage and instruction documentation files
• Major refactoring of git_submodules package versioning approach

Reviewed changes

Copilot reviewed 56 out of 58 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pre_commit/Dockerfile	Multi-stage build importing from go_modules and bundler images
updater/lib/dependabot/setup.rb	Removed pre_commit require statement
script/dependabot	Added pre_commit volume mount
go_modules/Dockerfile, npm_and_yarn/Dockerfile, cargo/Dockerfile, bundler/Dockerfile	Added ARG for parameterized base image
Gemfile.lock, updater/Gemfile.lock	Version downgrade from 0.362.0 to 0.361.1
pre_commit/lib/dependabot/pre_commit/metadata_finder.rb	Gutted implementation, changed to placeholder
pre_commit/spec/dependabot/pre_commit/metadata_finder_spec.rb	Removed all tests
updater/lib/dependabot/updater/group_update_creation.rb	Removed directory-aware PR matching logic
updater/lib/dependabot/dependency_change_builder.rb	Simplified error messages
npm_and_yarn/lib/dependabot/npm_and_yarn/update_checker/version_resolver.rb	Removed pnpm trust downgrade fallback
nuget/helpers/lib/NuGetUpdater/NuGetUpdater.Core/Updater/FileWriters/XmlFileWriter.cs	Removed wildcard version preservation
maven/lib/dependabot/maven/file_parser/property_value_finder.rb	Removed nested property resolution
gradle/*	Added experiment flags for gradle_wrapper_updater
git_submodules/*	Major refactoring of versioning approach
common/lib/dependabot/workspace/git.rb	Changed error capture logic
.github/instructions/*.instructions.md	Deleted all instruction files
.github/copilot-instructions.md	Consolidated all instructions into single file