add dependabot and test automation (#19)

.github/dependabot.yml

@@ -0,0 +1,24 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    open-pull-requests-limit: 20
+    schedule:
+      interval: "daily"
+      time: "09:00"
+      timezone: "America/New_York"
+    commit-message:
+      prefix: "[github-actions] "      
+  - package-ecosystem: "bundler"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      time: "08:30"
+      timezone: "America/New_York"
+    allow:
+      - dependency-type: "all"      
+    versioning-strategy: increase
+    open-pull-requests-limit: 20
+    insecure-external-code-execution: deny
+    commit-message:
+      prefix: "[bundler] "      

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: build
+on:
+  pull_request:
+  push:
+      branches:
+        - main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version: [3.2.2]
+        experimental: [false]
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: 'false'
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true # runs `bundle install` and caches installed gems automatically
+      - run: bundle exec rake