feat: add workflow for deploying playbook on merge

.gitea/workflows/deploy_playbook.yaml

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+name: Ansible CI/CD
+
+on:
+  pull_request:
+    branches:
+      - main
+    types: [closed]
+
+
+jobs:
+  deploy:
+    name: Deploy Ansible Playbook
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up SSH
+        run: |
+          echo "${{ secrets.DEVHOST_SSH_PRIVATE_KEY }}" > private_key.pem
+          chmod 600 private_key.pem
+          
+      - name: Install Ansible
+        shell: bash
+        run: |
+          sudo apt update
+          sudo apt install -y ansible
+
+      - name: Run Ansible Playbook
+        env:
+          ANSIBLE_USER: ${{ secrets.ANSIBLE_USER }}
+          ANSIBLE_HOST_KEY_CHECKING: False
+        run: |
+          ansible-playbook -i opdracht-2/inventory.ini opdracht-2/nginx.yml --private-key private_key.pem -u ${{ secrets.DEVHOST_ANSIBLE_USER }}

readme.md

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+For the CI/CD pipelines [this website](https://spacelift.io/blog/github-actions-ansible) was used.
+
+The runner is installed using the playbook in the `opdracht-2` directory.