Pack ImageBuilder as dotnet tool (#2007)

This is related to #2006.
Since ImageBuilder is only used natively on Windows (and not ran from
inside a container image), I would like to explore distributing
ImageBuilder as a tool instead of a container image for that platform.
The central hypothesis here is that we could potentially remove the
Windows build leg of ImageBuilder entirely, speeding up build and
iteration time.

This PR only adds a new acquisition channel for ImageBuilder. It does
not remove Windows container images or anything like that.

Author: lbussell

eng/Versions.props

@@ -5,7 +5,7 @@
   <PropertyGroup>
     <!-- Follow https://semver.org/spec/v2.0.0.html -->
     <MajorVersion>0</MajorVersion>
-    <MinorVersion>2</MinorVersion>
+    <MinorVersion>3</MinorVersion>
     <PatchVersion>0</PatchVersion>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
     <PreReleaseVersionLabel>beta</PreReleaseVersionLabel>

eng/pipelines/docker-tools-packages-official.yml

@@ -17,6 +17,7 @@ trigger:
     include:
     - eng/common/*
     - eng/pipelines/*
+    - src/ImageBuilder/*
     - src/ImageBuilder.Models/*
     - Directory.Build.props
     - Directory.Build.targets

eng/pipelines/docker-tools-packages-pr.yml

@@ -16,6 +16,7 @@ pr:
     include:
     - eng/common/*
     - eng/pipelines/*
+    - src/ImageBuilder/*
     - src/ImageBuilder.Models/*
     - Directory.Build.props
     - Directory.Build.targets

src/Dockerfile.linux

@@ -50,4 +50,4 @@ COPY ["notation-trust/policies/", "/notation-trust/policies/"]
 WORKDIR /image-builder
 COPY --from=build-env /image-builder/out ./
 
-ENTRYPOINT ["/image-builder/Microsoft.DotNet.ImageBuilder"]
+ENTRYPOINT ["/image-builder/imagebuilder"]

src/Dockerfile.windows

@@ -26,4 +26,4 @@ FROM mcr.microsoft.com/windows/$WINDOWS_BASE
 WORKDIR /image-builder
 COPY --from=build-env /image-builder/out ./
 
-ENTRYPOINT ["/image-builder/Microsoft.DotNet.ImageBuilder"]
+ENTRYPOINT ["/image-builder/imagebuilder"]

src/ImageBuilder/Microsoft.DotNet.ImageBuilder.csproj

@@ -12,6 +12,14 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <PropertyGroup Label="Tool Packaging">
+    <IsPackable>true</IsPackable>
+    <PackAsTool>true</PackAsTool>
+    <ToolCommandName>imagebuilder</ToolCommandName>
+    <PackageId>Microsoft.DotNet.ImageBuilder</PackageId>
+    <Description>CLI tool that orchestrates Docker image builds.</Description>
+  </PropertyGroup>
+
   <PropertyGroup>
     <!-- The "Cottle" templating package does not have a strong name. -->
     <SignAssembly>false</SignAssembly>