Add simple portal

.github/workflows/build.yaml

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+on:
+  push:
+    branches:
+      - main
+
+name: build
+
+env:
+  IMAGE_NAME: 'mijnbureau-portal'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+      actions: read
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images:  ghcr.io/minbzk/${{ env.IMAGE_NAME }}
+        env:
+          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: portal/
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          annotations: ${{ steps.meta.outputs.annotations }}
+          platforms: linux/amd64
+
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v2
+        with:
+          subject-name: ghcr.io/minbzk/${{ env.IMAGE_NAME}}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true

.gitignore

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+node_modules/
+portal/src/vendor/

portal/Dockerfile

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+FROM node:20 as build
+
+WORKDIR /app
+
+COPY package.json package-lock.json webpack.config.js ./
+COPY src/ ./src/
+
+RUN npm install
+RUN npm run build
+
+FROM nginx:1.27.3
+
+COPY --from=build /app/src /usr/share/nginx/html
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]

portal/compose.yaml

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+services:
+  portal:
+    build:
+      context: .
+    image: "docker.io/portal:latest"
+    ports:
+      - "8080:80"