Container Publish

dotnet publish /t:PublishContainer --os linux --arch x64

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
    <ContainerRepository>mycompany/myapp-api</ContainerRepository>
    <ContainerFamily>noble-chiseled</ContainerFamily>
  </PropertyGroup>

  <ItemGroup>
    <ContainerPort Include="8080" Type="tcp" />
    <ContainerEnvironmentVariable Include="ASPNETCORE_HTTP_PORTS" Value="8080" />
    <ContainerEnvironmentVariable Include="DOTNET_EnableDiagnostics" Value="0" />
    <ContainerLabel Include="org.opencontainers.image.vendor" Value="MyCompany" />
  </ItemGroup>

</Project>

# GitHub Container Registry
docker login ghcr.io
dotnet publish /t:PublishContainer --os linux --arch x64 \
    -p ContainerRegistry=ghcr.io \
    -p ContainerImageTag=1.0.0

# Azure Container Registry
az acr login --name myregistry
dotnet publish /t:PublishContainer --os linux --arch x64 \
    -p ContainerRegistry=myregistry.azurecr.io

# Docker Hub (requires username prefix in repository)
dotnet publish /t:PublishContainer --os linux --arch x64 \
    -p ContainerRegistry=docker.io \
    -p ContainerRepository=myuser/myapp

<PropertyGroup>
    <RuntimeIdentifiers>linux-x64;linux-arm64</RuntimeIdentifiers>
    <ContainerRuntimeIdentifiers>linux-x64;linux-arm64</ContainerRuntimeIdentifiers>
</PropertyGroup>

dotnet publish /t:PublishContainer

# Bash — note the quoting for semicolons
dotnet publish /t:PublishContainer --os linux --arch x64 \
    -p ContainerImageTags='"1.0.0;latest"'

<ContainerImageTags>1.0.0;latest</ContainerImageTags>

dotnet publish /t:PublishContainer --os linux --arch x64 \
    -p ContainerArchiveOutputPath=./images/myapp.tar.gz

# Scan with Trivy before pushing
trivy image --input ./images/myapp.tar.gz

<!-- Standard chiseled (InvariantGlobalization=true) -->
<ContainerFamily>noble-chiseled</ContainerFamily>

<!-- Chiseled with ICU for localization -->
<ContainerFamily>noble-chiseled-extra</ContainerFamily>

<PublishAot>true</PublishAot>
<!-- SDK picks runtime-deps:10.0-noble-chiseled-aot automatically -->

jobs:
  publish:
    runs-on: ubuntu-latest
    permissions:
      packages: write
    steps:
      - uses: actions/checkout@v5
      - uses: actions/setup-dotnet@v5
        with:
          dotnet-version: '10.0.x'
      - uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - run: |
          dotnet publish src/MyApp.Api/MyApp.Api.csproj \
            /t:PublishContainer --os linux --arch x64 \
            -p ContainerRegistry=ghcr.io \
            -p ContainerRepository=${{ github.repository_owner }}/myapp \
            -p ContainerImageTag=${{ github.sha }}

<!-- BAD — ContainerImageName is deprecated -->
<ContainerImageName>myapp</ContainerImageName>

<!-- GOOD — use ContainerRepository -->
<ContainerRepository>myapp</ContainerRepository>

# BAD — old approach, inconsistent across project types
dotnet publish -p:PublishProfile=DefaultContainer

# GOOD — use the MSBuild target directly
dotnet publish /t:PublishContainer

# BAD on Windows — may produce a Windows container
dotnet publish /t:PublishContainer

# GOOD — explicitly target Linux
dotnet publish /t:PublishContainer --os linux --arch x64

# BAD — fails with CONTAINER1013 error
dotnet publish /t:PublishContainer -p ContainerRegistry=ghcr.io

# GOOD — authenticate first
docker login ghcr.io
dotnet publish /t:PublishContainer -p ContainerRegistry=ghcr.io

<!-- BAD — SDK container publish cannot run apt-get or install native packages -->
<!-- There is no RUN equivalent -->

<!-- GOOD — create a custom base image with a Dockerfile first, then reference it -->
<ContainerBaseImage>myregistry/custom-base:1.0</ContainerBaseImage>