chore: incorporate gitops-engine lib preserving history

gitops-engine/Dockerfile

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+FROM golang:1.22 AS builder
+
+WORKDIR /src
+
+COPY go.mod /src/go.mod
+COPY go.sum /src/go.sum
+
+RUN go mod download
+
+# Perform the build
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /dist/gitops ./agent
+
+
+FROM alpine/git:v2.45.2
+COPY --from=builder /dist/gitops /usr/local/bin/gitops

gitops-engine/LICENSE

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+
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+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
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gitops-engine/Makefile

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+# docker image publishing options
+DOCKER_PUSH?=false
+IMAGE_NAMESPACE?=
+IMAGE_TAG?=latest
+ifdef IMAGE_NAMESPACE
+IMAGE_PREFIX=${IMAGE_NAMESPACE}/
+endif
+
+.PHONY: generate
+generate: agent-manifests
+
+.PHONY: test
+test:
+	go test -race ./... -coverprofile=coverage.out
+
+.PHONY: lint
+lint:
+	golangci-lint run
+
+.PHONY: agent-image
+agent-image:
+	docker build -t $(IMAGE_PREFIX)gitops-agent . -f Dockerfile
+	@if [ "$(DOCKER_PUSH)" = "true" ] ; then docker push $(IMAGE_PREFIX)gitops-agent:$(IMAGE_TAG) ; fi
+
+.PHONY: agent-manifests
+agent-manifests:
+	kustomize build ./agent/manifests/cluster-install > ./agent/manifests/install.yaml
+	kustomize build ./agent/manifests/namespace-install > ./agent/manifests/install-namespaced.yaml
+
+.PHONY: generate-mocks
+generate-mocks:
+	go generate -x -v "github.com/argoproj/gitops-engine/pkg/utils/tracing/tracer_testing"

gitops-engine/OWNERS

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+owners:
+- alexmt
+- jessesuen
+
+approvers:
+- alexec
+- alexmt
+- jannfis
+- jessesuen
+- mayzhang2000
+
+reviewers:
+- ash2k
+- dthomson25

gitops-engine/README.md

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+# GitOps Engine
+
+Various GitOps operators address different use-cases and provide different user experiences but all have similar set of core features. The team behind
+[Argo CD](https://github.com/argoproj/argo-cd) has implemented a reusable library that implements core GitOps features:
+
+- Kubernetes resource cache ✅
+- Resources reconciliation ✅
+- Sync Planning ✅
+- Access to Git repositories
+- Manifest Generation
+
+## Proposals, specifications and ideas
+
+Do you want to propose one more feature and want to enhance the existing one?
+Proposals and ideas are in markdown docs in the [`specs/`](specs/) directory.
+To create a new proposal, simply copy the spec [`template`](specs/template.md),
+name the file corresponding to the title of your proposal, and place it in the
+`specs/` directory.
+
+A good starting point to understand the structure is the [GitOps Engine Design spec](specs/design.md).
+
+We tried to answer frequently asked question in a [separate FAQ document](docs/faq.md).
+
+## Governance
+
+This project is licensed under the [Apache 2 license](LICENSE).
+
+The GitOps Engine follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).
+
+## Get involved
+
+If you are as excited about GitOps and one common engine for it as much as we are, please get in touch. If you want to write code that's great, if you want to share feedback, ideas and use-cases, that's great too.
+
+Find us on the [#argo-cd-contributors][argo-cd-contributors-slack] on CNCF Slack (get an [invite here][cncf-slack]).
+
+[argo-cd-contributors-slack]: https://cloud-native.slack.com/archives/C020XM04CUW
+[cncf-slack]: https://slack.cncf.io/
+
+### Contributing to the effort
+
+At this stage we are interested in feedback, use-cases and help on the GitOps Engine.

gitops-engine/agent/README.md

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+# GitOps Agent
+
+The GitOps Agent leverages the GitOps Engine and provides access to many engine features via a simple CLI interface.
+The agent provides the same set of core features as Argo CD including basic reconciliation, syncing as well as sync hooks and sync waves.
+
+The main difference is that the agent is syncing one Git repository into the same cluster where it is installed.
+
+## Quick Start
+
+By default, the agent is configured to use manifests from [guestbook](https://github.com/argoproj/argocd-example-apps/tree/master/guestbook)
+directory in https://github.com/argoproj/argocd-example-apps repository.
+
+The agent supports two modes:
+
+* namespaced mode - agent manages the same namespace where it is installed
+* full cluster mode - agent manages the whole cluster
+
+### Namespaced Mode
+
+Install the agent with the default settings using the command below. Done!
+
+```bash
+kubectl apply -f https://raw.githubusercontent.com/argoproj/gitops-engine/master/agent/manifests/install-namespaced.yaml 
+kubectl rollout status deploy/gitops-agent
+```
+
+The agent logs:
+
+```bash
+kubectl logs -f deploy/gitops-agent gitops-agent
+```
+
+Find the guestbook deployment in the current K8S namespace:
+
+```bash
+kubectl get deployment
+```
+
+### Cluster Mode
+
+The cluster mode grants full cluster access to the GitOps Agent. Use the following command to install an agent into the
+`gitops-agent` namespace and use it to manage resources in any cluster namespace.
+
+> Note. In cluster mode agents gets **full** cluster access.
+> See [gitops-agent-cluster-role.yaml](./manifests/cluster-install/gitops-agent-cluster-role.yaml) definition for more information. 
+
+```bash
+kubectl create ns gitops-agent
+kubectl apply -f https://raw.githubusercontent.com/argoproj/gitops-engine/master/agent/manifests/install.yaml -n gitops-agent
+```
+
+### Customize Git Repository
+
+The agent runs [git-sync](https://github.com/kubernetes/git-sync) as a sidecar container to access the repository.
+Update the container env [variables](https://github.com/kubernetes/git-sync#parameters) to change the repository.
+
+### Demo Recording
+
+[![asciicast](https://asciinema.org/a/FWbvVAiSsiI87wQx2TJbRMlxN.svg)](https://asciinema.org/a/FWbvVAiSsiI87wQx2TJbRMlxN)
+
+
+### Profiling
+
+Using env variables to enable profiling mode, the agent can be started with the following envs:
+
+```bash
+export GITOPS_ENGINE_PROFILE=web
+# optional, default pprofile address is 127.0.0.1:6060
+export GITOPS_ENGINE_PROFILE_HOST=127.0.0.1
+export GITOPS_ENGINE_PROFILE_PORT=6060
+```
+
+And then you can open profile in the browser(or using [pprof](https://github.com/google/pprof) cmd to generate diagrams):
+
+- http://127.0.0.1:6060/debug/pprof/goroutine?debug=2
+- http://127.0.0.1:6060/debug/pprof/mutex?debug=2