chore(deps): add auto-merge workflow for dependabot

Author: ns-vasilev

.github/workflows/dependabot.yml

@@ -0,0 +1,30 @@
+name: dependabot-auto-merge
+
+on: 
+    pull_request:
+        branches:
+        - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.user.login == 'dependabot[bot]' && github.repository == 'space-code/validator'
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v2
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      
+      - name: Enable auto-merge for Dependabot PRs
+        if: |
+          (steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
+           steps.metadata.outputs.update-type == 'version-update:semver-minor')
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}