Add CI

.github/dependabot.yml

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+version: 2
+updates:
+    - package-ecosystem: "bundler"
+      directory: "/"
+      schedule:
+        interval: "weekly"
+        day: "monday"
+        time: "09:00"
+        timezone: "UTC"
+      open-pull-requests-limit: 10
+      groups:
+        # only minor/patch updates
+        all:
+          patterns:
+            - "*"
+          update-types:
+            - "minor"
+            - "patch"
+      # Ignore any breaking changes
+      ignore:
+        - dependency-name: "*"
+          update-types:
+            - "version-update:semver-major"
+
+  # CI
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+      timezone: "UTC"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "ci(deps)"
+    groups:
+      # only minor/patch updates
+      github-actions:
+        patterns:
+          - "*"
+        update-types:
+          - "minor"
+          - "patch"
+    # Ignore any breaking changes
+    ignore:
+      - dependency-name: "*"
+        update-types:
+          - "version-update:semver-major"

.github/workflows/automerge.yml

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+name: Dependabot auto-merge
+
+on: pull_request_target
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-24.04
+    if: github.actor == 'dependabot[bot]'
+    steps:
+      - uses: fastify/github-action-merge-dependabot@v3
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          target: minor
+          use-github-auto-merge: true

.github/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.3'
+          bundler-cache: true
+
+      # fails on build errors
+      - name: Build site
+        run: bundle exec jekyll build --strict_front_matter --future
+        env:
+          JEKYLL_ENV: production

.github/workflows/security.yml

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+name: Security
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '0 9 * * 1'
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  scan:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Scan using grype
+        id: scan
+        uses: anchore/scan-action@v7.4.0
+        with:
+          path: "."
+          by-cve: true
+          output-format: sarif
+
+      - name: Upload SARIF report
+        uses: github/codeql-action/upload-sarif@v4
+        with:
+          sarif_file: ${{ steps.scan.outputs.sarif }}