Add Dockerfile and associated files

docker/Dockerfile

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+ARG ASPNET_IMAGE_TAG=7.0-bullseye-slim-amd64
+ARG DOTNET_SDK=7.0
+
+# Stage 2 - Build and publish dotnet application
+FROM mcr.microsoft.com/dotnet/sdk:${DOTNET_SDK} AS publish
+COPY . .
+RUN dotnet restore DfE.IdentifiersApi
+RUN dotnet build DfE.IdentifiersApi -c Release
+RUN dotnet publish DfE.IdentifiersApi -c Release -o /app --no-build
+
+COPY ./docker/docker-entrypoint.sh /app/docker-entrypoint.sh
+
+# Stage 3 - Put into Docker container that will actually be run
+FROM mcr.microsoft.com/dotnet/aspnet:${ASPNET_IMAGE_TAG} AS final
+COPY --from=publish /app /app
+WORKDIR /app
+RUN chmod +x ./docker-entrypoint.sh
+EXPOSE 80/tcp

docker/docker-compose.yml

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+version: "3.8"
+services:
+  webapp:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile
+    command: /bin/bash -c "./docker-entrypoint.sh dotnet DfE.IdentifiersApi.dll"
+    ports:
+      - 80:80/tcp
+    env_file:
+      - .env