Configure Dependabot and safe package auto-merge

Author: dgrah50

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 5
+    groups:
+      root-dependencies:
+        update-types:
+          - minor
+          - patch
+
+  - package-ecosystem: npm
+    directory: /Frontend/salt-frontend
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 10
+    groups:
+      frontend-dependencies:
+        update-types:
+          - minor
+          - patch
+
+  - package-ecosystem: nuget
+    directory: /Backend
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 5
+    groups:
+      backend-dependencies:
+        update-types:
+          - minor
+          - patch

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  frontend:
+    name: Frontend build
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: Frontend/salt-frontend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: Frontend/salt-frontend/package-lock.json
+      - run: npm ci
+      - run: npm run build
+
+  backend:
+    name: Backend build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 8.x
+      - run: dotnet restore Backend/SaltTask.fsproj
+      - run: dotnet build Backend/SaltTask.fsproj --configuration Release --no-restore

.github/workflows/dependabot-automerge.yml

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+name: Dependabot auto-merge
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  automerge:
+    name: Auto-merge safe dependency updates
+    if: github.event.pull_request.user.login == 'dependabot[bot]'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Wait for CI checks
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_URL: ${{ github.event.pull_request.html_url }}
+        run: gh pr checks "$PR_URL" --watch --fail-fast
+
+      - uses: dependabot/fetch-metadata@v2
+        id: metadata
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Enable auto-merge for patch and minor updates
+        if: >-
+          steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
+          steps.metadata.outputs.update-type == 'version-update:semver-minor'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_URL: ${{ github.event.pull_request.html_url }}
+        run: gh pr merge --auto --squash "$PR_URL"