chore(ci): consolidate maven workflows into .github/workflows/maven-ci.yml and remove duplicates

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Author: Copilot

.github/workflows/maven-ci.yml

@@ -0,0 +1,89 @@
+name: Maven CI
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch: {}
+
+env:
+  MAVEN_OPTS: -Xmx2g
+
+jobs:
+  build:
+    name: Build and Test (matrix)
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [8, 11, 17]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: ${{ matrix.java }}
+          cache: maven
+
+      - name: Cache local Maven repo
+        uses: actions/cache@v4
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+
+      - name: Build and run tests
+        run: mvn -B -U -e -DskipTests=false verify
+
+  publish:
+    name: Publish (snapshots/releases)
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 11
+          cache: maven
+
+      - name: Configure GPG key (for releases)
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          echo "$GPG_PRIVATE_KEY" | base64 --decode > private.key
+          gpg --batch --import private.key
+        env:
+          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY_BASE64 }}
+
+      - name: Deploy release to Maven Central
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
+          GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
+        run: |
+          mvn -B -P release -DskipTests deploy -Dgpg.passphrase="$GPG_PASSPHRASE"
+
+      - name: Deploy snapshot to OSSRH (on main branch)
+        if: github.ref == 'refs/heads/main'
+        env:
+          MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
+        run: |
+          mvn -B -DskipTests deploy -P snapshot