config: add deployment workflow (#8)

.github/workflows/automatic-release.yml

@@ -0,0 +1,41 @@
+name: Automatic Release
+
+on:
+  schedule:
+    - cron: 0 20 * * 5 # At 20:00 on Friday. - https://crontab.guru/#0_20_*_*_5
+  workflow_dispatch:
+
+env:
+  DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK_AUTOMATIC_RELEASE }}
+
+jobs:
+  merge:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Discord notification
+        env:
+          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
+        uses: Ilshidur/action-discord@master
+        with:
+          args: 'Preparing the automatic release...'
+      - uses: actions/checkout@v4
+      - uses: peter-evans/create-pull-request@v5
+        id: create-pull-request
+        with:
+          base: main
+          branch: dev
+          delete-branch: false
+          title: "(chore): version update"
+          reviewers: manuel-rw, meierschlumpf
+      - name: Check outputs
+        if: ${{ steps.create-pull-request.outputs.pull-request-number }}
+        run: |
+          echo "Pull Request Number - ${{ steps.create-pull-request.outputs.pull-request-number }}"
+          echo "Pull Request URL - ${{ steps.create-pull-request.outputs.pull-request-url }}"
+      - name: Discord notification
+        if: ${{ steps.create-pull-request.outputs.pull-request-number }}
+        env:
+          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
+        uses: Ilshidur/action-discord@master
+        with:
+          args: 'Deployment pull request has been created at [${{ steps.create-pull-request.outputs.pull-request-number }}](${{ steps.create-pull-request.outputs.pull-request-url }})'