Add actually CI :)

Author: cowtowncoder

.github/workflows/dep_build_v2.yml

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+name: Re-build on jackson-databind 2.x push
+on:
+  repository_dispatch:
+    types: [jackson-databind-pushed]
+  # just for testing
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    # Do we want wide matrix build? For now, limited
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # 03-Jun-2024, tatu: Apparently Scala won't like JDK 21
+        java_version: ['8', '11', '17']
+        os: ['ubuntu-22.04']
+    env:
+      JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
+    steps:
+    - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+    - name: Set up JDK
+      uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9 # v4.2.1
+      with:
+        distribution: 'temurin'
+        java-version: ${{ matrix.java_version }}
+        cache: 'maven'
+    - name: Build and test
+      run: ./mvnw -B -ff -ntp clean verify

.github/workflows/dep_build_v3.yml

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+name: Re-build on jackson-databind 3.x push
+on:
+  repository_dispatch:
+    types: [jackson-databind-pushed-v3]
+  # just for testing
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    # Do we want wide matrix build? For now, limited
+    runs-on: 'ubuntu-22.04'
+    strategy:
+      fail-fast: false
+      matrix:
+        java_version: ['17', '21']
+    env:
+      JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
+    steps:
+    - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+      with:
+        ref: main
+    - name: Set up JDK
+      uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9 # v4.2.1
+      with:
+        distribution: 'temurin'
+        java-version: ${{ matrix.java_version }}
+        cache: 'maven'
+    - name: Build and test
+      run: ./mvnw -B -ff -ntp clean verify

.github/workflows/main.yml

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+name: Build and Run Tests
+on:
+  push:
+    branches:
+    - main
+    - "2.19"
+  pull_request:
+    branches:
+    - main
+    - "2.19"
+  # Also run once per day anyway, at 10:00 UTC (18:00 PT)
+  schedule:
+    - cron: "0 10 * * *"
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        java_version: ['17', '21', '23']
+        os: ['ubuntu-22.04']
+    env:
+      JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
+    steps:
+    - uses: actions/checkout@v4.2.2
+    - name: Set up JDK
+      uses: actions/setup-java@v4.6.0
+      with:
+        distribution: 'temurin'
+        java-version: ${{ matrix.java_version }}
+        cache: 'maven'
+    - name: Build
+      run: ./mvnw -V -B -ff -ntp verify