add workflow (#1)

.github/CODEOWNERS

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+* @anna-money/cx-backend

.github/dependabot.yml

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+version: 2
+
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: daily

.github/workflows/pr.yml

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+name: Pull requests
+
+on:
+  pull_request:
+    branches: [ master ]
+  pull_request_target:
+    branches: [ master ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+      - name: Run local action
+        uses: ./
+        id: bump
+        with:
+          timezone: "Europe/London"
+          search_key: "Test comment"
+          text: Test comment