init docker build script

.gitea/workflows/docker.yml

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+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login to Registry
+        uses: docker/login-action@v2
+        with:
+          registry: eiche:3000
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Build Docker Image
+        env:
+          REGESTRY: eiche:3000
+          IMAGE: ${{ GITHUB_REPOSITORY }}
+        run: |
+          # Build the image with the commit hash tag
+          docker build -t ${REGISTRY}/${IMAGE}:${GITHUB_RUN_NUMBER} .
+
+          # Tag the same image as "latest"
+          docker tag ${REGISTRY}/${IMAGE}:${GITHUB_RUN_NUMBER} ${REGISTRY}/${IMAGE}:latest
+
+      - name: Push Docker Images
+        env:
+          REGESTRY: eiche:3000
+          IMAGE: ${{ GITHUB_REPOSITORY }}
+        run: |
+          docker push ${REGISTRY}/${IMAGE}:${GITHUB_RUN_NUMBER}
+          docker push ${REGISTRY}/${IMAGE}:latest
+
+      - name: Log out from registry
+        if: always()
+        run: docker logout eiche:3000

Dockerfile

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+FROM eclipse-temurin:17
+RUN curl -sL https://deb.nodesource.com/setup_16.x | bash - && \
+    apt-get update && \
+    apt -y install nodejs && \
+    apt-get clean