Add gh workflows.

Author: dweiss

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: "/"
+    commit-message:
+      prefix: deps(ghactions)
+    schedule:
+      interval: "weekly"
+    labels: [dependencies]
+
+  - package-ecosystem: gradle
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+    commit-message:
+      prefix: deps(java)
+    labels: [dependencies]

.github/workflows/build-and-test.yml

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+name: Build, test and validate (reusable workflow)
+
+on:
+  workflow_call:
+    inputs:
+      gradle-options:
+        type: string
+        description: "Any extra options to be passed to gradle"
+        required: false
+        default: ""
+
+      os:
+        type: string
+        description: "OS to run on."
+        required: true
+        default: "ubuntu-latest"
+
+      jdk-version:
+        type: string
+        required: true
+        description: "JDK version to use." 
+
+      run-tests:
+        description: "Run tests"
+        type: boolean
+        default: true
+
+jobs:
+  build-and-test:
+    name: test and assemble (JDK ${{ inputs.jdk-version }} on ${{ inputs.os }})
+    runs-on: ${{ inputs.os }}
+    timeout-minutes: 30
+
+    env:
+      CI: true
+
+    steps:
+      - uses: carrotsearch/infra-public/.github/actions/prepare-git-clone@master
+        with:
+          token: ${{ secrets.GH_ACCESS_TOKEN }}
+
+      - uses: carrotsearch/infra-public/.github/actions/prepare-gradle-build@master
+        with:
+          jdk-version: ${{ inputs.jdk-version }}
+
+      - name: Run validation checks
+        run: ./gradlew check assemble ${{ inputs.gradle-options }}

.github/workflows/build-on-commit.yml

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+name: Build and test (on commits and PRs)
+
+on: 
+  workflow_dispatch:
+    # Allow manual dispatch.
+
+  pull_request:
+    branches:
+      - main
+
+  push:
+    branches:
+      - main
+
+jobs:
+  tests:
+    name: run checks
+
+    strategy:
+      matrix:
+        os: [ ubuntu-latest ]
+        jdk-version: [ '21', '25' ]
+
+    uses: ./.github/workflows/build-and-test.yml
+    secrets: inherit
+    with:
+      gradle-options:
+      os: ${{ matrix.os }}
+      jdk-version: ${{ matrix.jdk-version }}