Add prepare release workflow

.github/workflows/prepare-release.yml

@@ -0,0 +1,37 @@
+name: Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Release version'
+        required: true
+
+jobs:
+  prepare:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up JDK 23
+      uses: actions/setup-java@v4
+      with:
+        java-version: '23'
+        distribution: 'temurin'
+        cache: maven
+    - name: Set release version
+
+      run: |
+        mvn -B -ntp -f jgpio/pom.xml versions:set -DnewVersion=${{ github.event.inputs.version }}
+        mvn -B -ntp -f jgpio-it/pom.xml versions:set -DnewVersion=${{ github.event.inputs.version }}
+        mvn -B -ntp -f examples/pom.xml versions:set-property -Dproperty=jgpio.version -DnewVersion=${{ github.event.inputs.version }}
+        sed -i '/<version>/s/>.*</>${{ github.event.inputs.version }}</' README.md
+
+    - name: Create Pull Request
+      uses: peter-evans/create-pull-request@v7
+      with:
+        commit-message: 'Release ${{ github.event.inputs.version }}'
+        branch: 'release-${{ github.event.inputs.version }}'