ci: Add initial workflows

Author: jeffjensen

.github/actions/jdk-setup/action.yml

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+name: "JDK Setup"
+runs:
+  using: "composite"
+  steps:
+    - name: Set up JDK 21
+      uses: actions/setup-java@v5
+      with:
+        java-version: '21'
+        distribution: 'temurin'
+        cache: maven

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+
+  - package-ecosystem: maven
+    directory: /
+    schedule:
+      interval: weekly

.github/workflows/build-any-branch.yml

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+name: Build any branch
+
+on:
+  push:
+    paths-ignore:
+      - 'src/site/**'
+      - '**/*.adoc'
+      - '**/*.md'
+  pull_request:
+    paths-ignore:
+      - 'src/site/**'
+      - '**/*.adoc'
+      - '**/*.md'
+
+env:
+  MAVEN_COMMAND: ./mvnw
+  MAVEN_CLI_COMMON: "-e -B"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/jdk-setup
+      - name: Build and verify
+        run: ${{ env.MAVEN_COMMAND }} ${{ env.MAVEN_CLI_COMMON }} clean verify
+      - name: Submit dependencies to GitHub
+        if: github.actor != 'dependabot[bot]'
+        uses: advanced-security/maven-dependency-submission-action@v5

.github/workflows/deploy-snapshot.yml

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+name: Deploy Snapshot
+
+on:
+  workflow_run:
+    workflows: ["Build any branch"]
+    types: [completed]
+    branches: [main]
+
+env:
+  MAVEN_COMMAND: ./mvnw
+  MAVEN_CLI_COMMON: "-e -B"
+
+jobs:
+  deploy-snapshot:
+    if: github.event.workflow_run.conclusion == 'success'
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/jdk-setup
+      - uses: actions/setup-java@v5
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          server-id: central-publish
+          server-username: CENTRAL_USERNAME
+          server-password: CENTRAL_TOKEN
+
+      - name: Get project version
+        id: ver
+        run: echo "version=$(${{ env.MAVEN_COMMAND }} help:evaluate -Dexpression=project.version -q -DforceStdout)" >> $GITHUB_OUTPUT
+
+      - name: Deploy snapshot to Maven Central
+        if: endsWith(steps.ver.outputs.version, '-SNAPSHOT')
+        env:
+          CENTRAL_USERNAME: ${{ secrets.CENTRAL_USERNAME }}
+          CENTRAL_TOKEN: ${{ secrets.CENTRAL_TOKEN }}
+        run: ${{ env.MAVEN_COMMAND }} ${{ env.MAVEN_CLI_COMMON }} deploy -DskipTests
+
+      - name: Skip (not a snapshot version)
+        if: "!endsWith(steps.ver.outputs.version, '-SNAPSHOT')"
+        run: echo "Version ${{ steps.ver.outputs.version }} is a release version — skipping snapshot deploy"

.github/workflows/publish-docs.yml

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+name: Build and Deploy Maven Site to GitHub Pages
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+    paths:
+      - 'src/site/**'
+      - '**/*.adoc'
+      - '**/*.md'
+  workflow_run:
+    workflows: ["Build any branch"]
+    types: [completed]
+    branches: [main]
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+env:
+  MAVEN_COMMAND: ./mvnw
+  MAVEN_CLI_COMMON: "-e -B"
+
+jobs:
+  build-site:
+    if: github.event_name != 'workflow_run' || github.event.workflow_run.conclusion == 'success'
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/jdk-setup
+      - name: Build project
+        run: ${{ env.MAVEN_COMMAND }} ${{ env.MAVEN_CLI_COMMON }} install -DskipTests
+      - name: Generate Maven site
+        run: ${{ env.MAVEN_COMMAND }} ${{ env.MAVEN_CLI_COMMON }} site -Dproject.build.outputTimestamp=$(date -u +%Y-%m-%dT%H:%M:%SZ)
+      - name: Upload Pages artifact
+        if: >-
+          github.event_name == 'workflow_dispatch' ||
+          github.event_name == 'push' ||
+          github.event_name == 'workflow_run'
+        uses: actions/upload-pages-artifact@v5
+        with:
+          path: target/site/
+
+  deploy:
+    needs: build-site
+    if: >-
+      github.event_name == 'workflow_dispatch' ||
+      github.event_name == 'push' ||
+      github.event_name == 'workflow_run'
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v5