feat: sync repos under staging folder to individual repos

Signed-off-by: Bird <aflybird0@gmail.com>

Author: aFlyBird0

.github/sync-staging-repo.yml

@@ -0,0 +1,20 @@
+devstream-io/dtm-github-action-example:
+  - source: staging/dtm-github-action-example/
+    dest: .
+    deleteOrphaned: true
+devstream-io/dtm-jenkins-pipeline-example:
+  - source: staging/dtm-jenkins-pipeline-example/
+    dest: .
+    deleteOrphaned: true
+devstream-io/dtm-repo-scaffolding-golang:
+  - source: staging/dtm-repo-scaffolding-golang/
+    dest: .
+    deleteOrphaned: true
+devstream-io/dtm-repo-scaffolding-golang-cli:
+  - source: staging/dtm-repo-scaffolding-golang-cli/
+    dest: .
+    deleteOrphaned: true
+devstream-io/dtm-repo-scaffolding-java-springboot:
+  - source: staging/dtm-repo-scaffolding-java-springboot/
+    dest: .
+    deleteOrphaned: true

.github/workflows/sync-staging-repo.yml

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+name: Sync Staging Files to Other Repos
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - staging/**
+      - .github/workflows/sync-staging-repo.yml
+      - .github/sync-staging-repo.yml
+  workflow_dispatch:
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Run GitHub File Sync
+        uses: BetaHuhn/repo-file-sync-action@v1.16.5
+        with:
+          GH_PAT: ${{ secrets.GH_PAT }}
+          CONFIG_PATH: .github/sync-staging-repo.yml
+          ORIGINAL_MESSAGE: true
+          SKIP_PR: true
+          COMMIT_EACH_FILE: false

staging/README.md

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+# Staging Repos
+
+This directory contains the staging repositories for the Devstream project.
+
+Each sub folder under `staging/` be synchronized to the repository of the same name under devstream-io.
+
+## How to Create a New Staging Repo
+
+Person who wants to create a new staging repo:
+
+1. Create a new directory under `staging/` with the name of the repo you want to create.
+2. Update `.github/sync-staging-repo.yml`.
+3. Pull Request to the `main` branch of repo `devstream-io/devstream`.
+
+Reviewers:
+
+1. Review the PR, make sure everything is correct, and do not merge it immediately.
+2. Create the repo under the `devstream-io` organization and **create a branch for the repo**. If you don't have the permission to create a repo, please ask for the members of the `devstream-io`.
+3. Merge the PR.