feat: Add docker file

Add docker file to run the BKCCalculatorApi.

.github/workflows/release-docker-image.yml

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+name: Release Docker Image
+
+on:
+  release:
+    types: [created]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-docker:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+# Use the official .NET SDK image as a base image
+FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build-env
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy the .csproj and restore as distinct layers
+COPY ["BKRCalculator/*.csproj", "BKRCalculator/"]
+COPY ["BKRCalculatorApi/*.csproj", "BKRCalculatorApi/"]
+
+RUN dotnet restore "BKRCalculatorApi/BKRCalculatorApi.csproj"
+
+# Copy the remaining files
+COPY . ./
+
+# Build the application
+RUN dotnet publish -c Release -o out
+
+# Build the runtime image
+FROM mcr.microsoft.com/dotnet/aspnet:7.0
+WORKDIR /app
+COPY --from=build-env /app/out .
+ENTRYPOINT ["dotnet", "BKRCalculatorApi.dll"]