Create Dockerfile for migrations

templates/service/database/Dockerfile

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+FROM microsoft/dotnet:2.2-sdk-alpine AS build
+RUN apk add --no-cache bash
+COPY . .
+
+WORKDIR /templates/service/host/IdentityServerHost
+RUN dotnet restore -nowarn:msb3202,nu1503
+RUN dotnet build --no-restore -c Release
+
+WORKDIR /templates/service/host/MyCompanyName.MyProjectName.Host
+RUN dotnet restore -nowarn:msb3202,nu1503
+RUN dotnet build --no-restore -c Release
+
+FROM build AS final
+WORKDIR /src
+COPY --from=build /templates/service/host/IdentityServerHost ./IdentityServerHost
+COPY --from=build /templates/service/host/MyCompanyName.MyProjectName.Host ./MyCompanyName.MyProjectName.Host
+COPY --from=build /templates/service/database/entrypoint.sh .
+RUN /bin/bash -c "sed -i $'s/\r$//' entrypoint.sh"
+RUN chmod +x ./entrypoint.sh
+
+ENTRYPOINT ["./entrypoint.sh"]

templates/service/database/entrypoint.sh

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+#!/bin/bash
+
+cd IdentityServerHost
+export ConnectionStrings__Default=$IdentityServerConnectionString
+
+until dotnet ef database update --no-build; do
+>&2 echo "SQL Server is starting up"
+sleep 1
+done
+
+export ConnectionStrings__Default=$MyProjectNameConnectionString
+cd MyCompanyName.MyProjectName.Host && dotnet ef database update --no-build