Sitecore 10.1 and kubernetes container for serialization

Dockerfile

# escape=`

FROM mcr.microsoft.com/dotnet/sdk:3.1 as prep

ENV SITECORE_PUBLIC_NUGET_FEED=https://sitecore.myget.org/F/sc-packages/api/v3/index.json
ENV CM_HOST=
ENV ID_HOST=
ENV CLIENT=
ENV SECRET=
ENV ENVIRONMENT=dev

SHELL ["pwsh", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
USER ContainerAdministrator
WORKDIR /content/
COPY .config .
COPY sitecore.json .
COPY docker/build/content/start.ps1 /

RUN `
    dotnet nuget add source -n Sitecore $env:SITECORE_PUBLIC_NUGET_FEED; `
    dotnet tool restore --add-source=$env:SITECORE_PUBLIC_NUGET_FEED; `
    dotnet sitecore plugin add -n Sitecore.DevEx.Extensibility.Serialization; `
    dotnet sitecore plugin add -n Sitecore.DevEx.Extensibility.Publishing;

FROM prep as create
COPY src/ /content/src/
RUN dotnet sitecore ser pkg create -o content --overwrite

FROM prep as final
COPY --from=create /content/content.itempackage .

ENTRYPOINT "pwsh" "-File" "/start.ps1"

start.ps1

dotnet sitecore login -n $env:ENVIRONMENT --client-credentials true --auth "$env:ID_HOST" --cm "$env:CM_HOST" --allow-write true --client-id "$env:CLIENT" --client-secret "$env:SECRET"
if ($LASTEXITCODE -ne 0) {
    Write-Error "Unable to log into Sitecore, did the Sitecore environment start correctly? See logs above."
}

if ($null -eq $env:EXCLUDE -or $env:EXCLUDE -eq "") {
    write-host "Pushing content"    
    dotnet sitecore ser pkg install -f content.itempackage -n $env:ENVIRONMENT
} else {
    write-host "Pushing content with $env:EXCLUDE excluded"
    dotnet sitecore ser pkg install -f content.itempackage -n $env:ENVIRONMENT --exclude "$env:EXCLUDE"
}
dotnet sitecore publish --verbose -n $env:ENVIRONMENT