Initial setup with github action

Author: Dieter Baier

.github/workflows/create-docs-toolbox-image.yml

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+name: Build Docs
+
+on:
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  build-image:
+    runs-on: ubuntu-latest
+    outputs:
+      image_name: ${{ steps.setImageName.outputs.IMAGE_NAME }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set image name
+        id: setImageName
+        run: |
+          echo "IMAGE_NAME_LATEST=ghcr.io/${{ github.repository_owner }}/docs-toolbox:latest" >> $GITHUB_OUTPUT
+
+      - name: Login to GHCR
+        run: echo "${{ secrets.GHCR_PAT }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build (or reuse cache) and push image
+        run: |
+          docker buildx build \
+            --platform linux/amd64,linux/arm64 \
+            -t ${{ steps.setImageName.outputs.IMAGE_NAME_LATEST }} \
+            --cache-from=type=registry,ref=${{ steps.setImageName.outputs.IMAGE_NAME_LATEST }} \
+            --cache-to=type=registry,ref=${{ steps.setImageName.outputs.IMAGE_NAME_LATEST }},mode=max \
+            --push .

.gitignore

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+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

Dockerfile

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+# ---------------------------
+# Base Image: Java + Tools
+# ---------------------------
+FROM openjdk:22-jdk-slim
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    pandoc \
+    graphviz \
+    unzip \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Arbeitsverzeichnis
+WORKDIR /app
+
+# Flexible entrypoint – beliebige Commands
+ENTRYPOINT []