feat: Add dependabot automerging action (#956)

Co-authored-by: Roberto Pastor Muela <37798125+RobPasMue@users.noreply.github.com>

Author: AlejandroFernandezLuces

.github/workflows/dependabot_automerge.yml

@@ -0,0 +1,33 @@
+name: Dependabot auto-merge
+on: pull_request
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]'
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Approve a PR
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+
+      - name: PyAnsys Bot Login
+        run: echo "${{ secrets.PYANSYS_CI_BOT_TOKEN }}" | gh auth login --with-token
+
+      - name: Enable auto-merge for Dependabot PRs
+        if: steps.metadata.outputs.update-type != 'version-update:semver-major'
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}