chore: adds scripts to perform gitops-engine migration (#24291)

Signed-off-by: Patroklos Papapetrou <ppapapetrou76@gmail.com>
Signed-off-by: Papapetrou Patroklos <1743100+ppapapetrou76@users.noreply.github.com>
Co-authored-by: Josh Soref <2119212+jsoref@users.noreply.github.com>
Co-authored-by: Leonardo Luz Almeida <leoluz@users.noreply.github.com>

hack/migrate-gitops-engine/merge.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+# Script to collect GitHub handle and branch name from user
+
+echo "Please provide the following information:"
+echo
+
+# Prompt for GitHub handle
+read -r -p "Enter your GitHub handle: " github_handle
+
+# Validate that GitHub handle is not empty
+while [[ -z "$github_handle" ]]; do
+    echo "GitHub handle cannot be empty."
+    read -r -p "Enter your GitHub handle: " github_handle
+done
+
+# Prompt for branch name
+read -r -p "Enter the branch name: " branch_name
+
+# Validate that branch name is not empty
+while [[ -z "$branch_name" ]]; do
+    echo "Branch name cannot be empty."
+    read -r -p "Enter the branch name: " branch_name
+done
+
+echo "Merging migrated gitops-engine branch $branch_name from $github_handle/gitops-engine.git"
+
+git remote add ge-migrated git@github.com:"$github_handle"/gitops-engine.git
+git fetch ge-migrated
+
+if git merge --no-edit ge-migrated/"$branch_name" --allow-unrelated-histories ; then
+    sh ./hack/migrate-gitops-engine/replace-vendor.sh
+    sh ./hack/migrate-gitops-engine/update-dockerfile.sh
+    echo "Merging of gitops-engine branch $branch_name from $github_handle/gitops-engine.git succeeded"
+else
+    echo "Merging of gitops-engine branch $branch_name from $github_handle/gitops-engine.git failed"
+    exit 1
+fi
+
+

hack/migrate-gitops-engine/replace-vendor.sh

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+#!/bin/bash
+
+# Script to replace all occurrences of "go mod vendor" with "go work vendor" recursively
+
+set -e
+
+# Add common Go binary path to PATH if not already present
+export PATH=$PATH:/usr/local/go/bin
+
+go work init ./gitops-engine
+go work use .
+go work vendor
+go mod tidy
+
+echo "Searching for files containing 'go work vendor'..."
+
+# Replace in each file
+for file in Makefile Tiltfile hack/generate-proto.sh .github/workflows/bump-major-version.yaml .github/workflows/ci-build.yaml; do
+    echo "Processing: $file"
+    # Create a backup and replace
+    sed -i.bak 's/go mod vendor/go work vendor/g' "$file"
+    echo "  - Replaced occurrences in $file"
+    echo "  - Backup created: $file.bak"
+done
+
+echo
+echo "Replacement complete!"
+echo "Removing backup files..."
+find . -name '*.bak' -delete
+
+echo "Syncing go mod files..."
+go work sync
+go mod tidy
+go work vendor
+

hack/migrate-gitops-engine/update-dockerfile.sh

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+#!/bin/bash
+
+# Script to add two lines after the line containing "COPY go.* ./" in Dockerfile
+# The first line adds "green" and the second adds "red"
+
+DOCKERFILE="Dockerfile"
+
+# Check if Dockerfile exists
+if [[ ! -f "$DOCKERFILE" ]]; then
+    echo "Error: $DOCKERFILE not found!"
+    exit 1
+fi
+
+# Use sed to insert the two lines after the line containing "COPY go.* ./"
+# The pattern looks for the line containing "COPY go.* ./" and adds two lines after it
+sed -i.tmp '/COPY go\.\* \.\//{
+a\
+RUN mkdir -p gitops-engine
+a\
+COPY gitops-engine/go.* ./gitops-engine
+}' "$DOCKERFILE"
+
+# Remove the temporary file created by sed
+rm "${DOCKERFILE}.tmp" 2>/dev/null || true
+
+echo "Successfully added required lines to $DOCKERFILE:"
+echo ""
+echo "Lines around the modification:"
+grep -n -A 3 -B 1 "COPY go\.\* \./" "$DOCKERFILE"