ci(docker): add distroless Dockerfiles and parallel build pipeline

.github/workflows/build-images.yml

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+name: Build and Push Images
+
+on:
+  pull_request:
+    branches:
+      - main
+      - develop
+  push:
+    branches:
+      - feat/dockerize
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_PREFIX: ${{ github.repository }}
+
+jobs:
+  build-catalogue:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}/catalogue
+          tags: |
+            type=ref,event=pr
+            type=sha,prefix=pr-${{ github.event.pull_request.number }}-
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./catalogue
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  build-frontend:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}/frontend
+          tags: |
+            type=ref,event=pr
+            type=sha,prefix=pr-${{ github.event.pull_request.number }}-
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./frontend
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  build-recommendation:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}/recommendation
+          tags: |
+            type=ref,event=pr
+            type=sha,prefix=pr-${{ github.event.pull_request.number }}-
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./recommendation
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  build-voting:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}/voting
+          tags: |
+            type=ref,event=pr
+            type=sha,prefix=pr-${{ github.event.pull_request.number }}-
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./voting
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

catalogue/Dockerfile

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+# Build stage
+FROM python:3.11-slim AS builder
+
+WORKDIR /app
+
+# Copy requirements and install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir --user -r requirements.txt
+
+# Runtime stage
+FROM gcr.io/distroless/python3-debian12
+
+WORKDIR /app
+
+# Copy Python packages from builder
+COPY --from=builder /root/.local /root/.local
+ENV PATH=/root/.local/bin:$PATH
+
+# Copy application code
+COPY app.py .
+COPY products.json .
+COPY config.json .
+COPY templates/ templates/
+COPY static/ static/
+
+# Expose port
+EXPOSE 5000
+
+# Run with gunicorn
+CMD ["-m", "gunicorn", "--bind", "0.0.0.0:5000", "app:app"]

frontend/Dockerfile

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+# Build stage
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files and install dependencies
+COPY package*.json ./
+RUN npm install --production
+
+# Runtime stage
+FROM gcr.io/distroless/nodejs18-debian12
+
+WORKDIR /app
+
+# Copy node_modules from builder
+COPY --from=builder /app/node_modules ./node_modules
+
+# Copy application code
+COPY app.js .
+COPY config.json .
+COPY routes/ routes/
+COPY views/ views/
+COPY public/ public/
+
+# Expose port
+EXPOSE 3000
+
+# Run the application
+CMD ["app.js"]

recommendation/Dockerfile

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+# Build stage
+FROM golang:1.20-alpine AS builder
+
+WORKDIR /app
+
+# Copy go mod files
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build the application
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o recommendation .
+
+# Runtime stage
+FROM gcr.io/distroless/static-debian12
+
+WORKDIR /app
+
+# Copy binary from builder
+COPY --from=builder /app/recommendation .
+
+# Copy static files and templates
+COPY --from=builder /app/templates ./templates
+COPY --from=builder /app/static ./static
+COPY --from=builder /app/data ./data
+COPY --from=builder /app/config.json .
+
+# Expose port
+EXPOSE 8080
+
+# Run the application
+CMD ["./recommendation"]

voting/Dockerfile

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+# Build stage
+FROM maven:3.8-openjdk-17 AS builder
+
+WORKDIR /app
+
+# Copy pom.xml and download dependencies
+COPY pom.xml .
+RUN mvn dependency:go-offline -B
+
+# Copy source code and build
+COPY src ./src
+RUN mvn clean package -DskipTests
+
+# Runtime stage
+FROM gcr.io/distroless/java17-debian12
+
+WORKDIR /app
+
+# Copy jar from builder
+COPY --from=builder /app/target/*.jar app.jar
+
+# Expose port
+EXPOSE 8080
+
+# Run the application
+CMD ["app.jar"]