chore: added workflows check conflict and signed

.github/CODEOWNERS

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+# https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners#example-of-a-codeowners-file
+*       @ddevsr

.github/workflows/check-conflict.yml

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+name: Check conflict branch in PR
+on:
+  schedule:
+    - cron: '*/20 * * * *' # Run at every 20 minutes
+
+jobs:
+  build:
+    name: Check conflict branch in PR
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Check conflict branch in PR
+        uses: PHPDevsr/check-conflict-action@v1.0.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          label: stale
+          comment: |
+            :wave: Hi, @authorTarget!
+
+            We detected conflicts in your PR against the base branch :speak_no_evil:
+            You may want to sync :arrows_counterclockwise: your branch with upstream!
+
+            Ref: [Syncing Your Branch](https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/workflow.md#pushing-your-branch)

.github/workflows/check-signed.yml

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+name: Check Signed PR
+on:
+  pull_request:
+    branches:
+      - 'dev'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Check Signed Commit
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Check signed commits in PR
+        uses: 1Password/check-signed-commits-action@v1
+        with:
+          comment: |
+            You must GPG-sign your work, certifying that you either wrote the work or otherwise have the right to pass it on to an open-source project. See Developer's Certificate of Origin. See [signing][1].
+
+            **Note that all your commits must be signed.** If you have an unsigned commit, you can sign the previous commits by referring to [gpg-signing-old-commits][2].
+            [1]: https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md#signing
+            [2]: https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/workflow.md#gpg-signing-old-commits