feat(dependabot): enhance configuration and remove stale actions

- Updated Dependabot configuration to include public NuGet registry and improved scheduling for package updates to daily frequency.
- Removed stale configuration file and replaced with a new GitHub Actions workflow to manage stale issues and pull requests.
- Renamed pipeline workflow to main for clarity and consistency.

This refactor aims to streamline dependency management and improve issue tracking.

Author: winromulus

.github/dependabot.yml

@@ -1,16 +1,30 @@
 version: 2
+registries:
+  public-nuget:
+    type: nuget-feed
+    url: https://api.nuget.org/v3/index.json
 updates:
-- package-ecosystem: nuget
-  directory: "/"
-  schedule:
-    interval: weekly
-  open-pull-requests-limit: 10
-
-- package-ecosystem: github-actions
-  directory: "/"
-  schedule:
-    interval: weekly
-  groups:
-    actions:
-      patterns:
-        - "*"
+  - package-ecosystem: nuget
+    directory: "/"
+    registries:
+      - public-nuget
+    schedule:
+      interval: daily
+    open-pull-requests-limit: 15
+    labels:
+      - "area-dependencies"
+    groups:
+      all-dependencies:
+        patterns:
+          - "*"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: daily
+    open-pull-requests-limit: 5
+    labels:
+      - "area-dependencies"
+    groups:
+      all-dependencies:
+        patterns:
+          - "*"

.github/stale.yml

@@ -0,0 +1,35 @@
+name: Dependabot auto-approve-and-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]'
+    steps:
+      - name: Fetch Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v2
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          skip-commit-verification: true
+          skip-verification: true
+
+      - name: Enable auto-merge
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.ES_GITHUB_PAT }}
+
+      - name: Approve the PR
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.ES_GITHUB_PAT }}