chore: incorporate gitops-engine lib preserving history

[leoluz]

fix #10774

This PR incorporates the gitops-engine library in the Argo CD main repository preserving the its history. It leverages the Go Workspace feature to make the gitops-engine library work seamlessly without major package refactoring changes.

First the gitops-engine repo needs to be prepared for the migration. The preparation consists of:

1. moving all necessary files in that repo under a single folder (gitops-engine)
2. Removing all unnecessary files
3. Pushing the changes to a branch.

The following commands were executed for the steps 1 and 2 above:

mkdir gitops-engine
find . -type d \( -path ./gitops-engine -o -path ./.git -o -path ./.github -o -path ./.gitignore \) -prune -o -type f \( -path ./.gitignore -o -path ./.golangci.yaml -o -path ./codecov.yml -o -path ./sonar-project.properties -o -path . \) -prune -o -name '*' -maxdepth 1 -exec echo {} \;
git rm -r .github
git rm .gitignore
git rm .golangci.yaml
git rm codecov.yml
git rm sonar-project.properties

Then we push the changes in a separate branch: git push origin migrate

Steps executed in this repo after executing the procedure above:

git remote add ge-leo git@github.com:leoluz/gitops-engine.git
git fetch ge-leo
git merge ge-leo/migrate --allow-unrelated-histories
# edit the go.mod and remove all references from gitops-engine from it
go work init ./gitops-engine
go work use .
go work vendor
go mod tidy

At this stage we can build Argo CD locally using the local gitops-engine as part of the GO workspace:

make cli-local

[bunnyshell]

❌ Preview Environment deleted from Bunnyshell

Available commands (reply to this comment):

• 🚀 /bns:deploy to deploy the environment

[leoluz]

There are a few things that needs to be fixed:

Basically with Go workspaces we can't run go mod vendor anymore. We must run go work vendor instead. I am not too sure if we still need that vendor folder in the project.

The following Github check are failing with the error below:

• Integration tests / Build & cache Go code (pull_request)
• Integration tests / Check changes to generated code (pull_request)
• Integration tests / Ensure Go modules synchronicity (pull_request)

Run go mod download
2  go mod download
3  shell: /usr/bin/bash -e {0}
4  env:
5    GOLANG_VERSION: 1.24.1
6go: k8s.io/externaljwt@v0.0.0: invalid version: unknown revision v0.0.0  

The docker image build job is also failing. Fix seems to be simple as the gitops-engine folder needs to be added to the Dockerfile:

Image/ build-only / publish (pull_request)