dockerfile: reduce build time for WSC-based image

Turns out that caching the golang:windowsservercore-ltsc2022 image between
GithubAction workflow runs is a bad idea because `docker load` command still takes
too long to load image from cached archive (~9-10min on standard windows runner).
And after that runner still needs to build the neo-go image itself.

However, standard GA windows runner is supplied with prefetched latest
mcr.microsoft.com/windows/servercore:ltsc2022 image, so using it costs almost
nothing. Thus, the other approach is implemented: we use standard
mcr.microsoft.com/windows/servercore:ltsc2022 image as both build-base and
final-base. Then we install all required tools for building neo-go manually
on build-base image (these tools are git and go 1.17). Compared to the first
approach, the publishing job (included build and publish to DockerHub)
takes ~7-8min to finish.

.github/workflows/publish_to_dockerhub.yml

@@ -138,6 +138,9 @@ jobs:
           # Allows to fetch all history for all branches and tags. Need this for proper versioning.
           fetch-depth: 0
 
+      - name: Show docker images
+        run: docker images
+
       - name: Build image
         run: make image-wsc
 

Dockerfile.wsc

@@ -1,5 +1,25 @@
 # Builder image
-FROM golang:windowsservercore-ltsc2022 as builder
+FROM mcr.microsoft.com/windows/servercore:ltsc2022 as builder
+
+SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop';", "$ProgressPreference = 'SilentlyContinue';"]
+
+ENV GIT_VERSION=2.23.0
+
+ENV GIT_TAG=v2.23.0.windows.1
+
+ENV GIT_DOWNLOAD_URL=https://github.com/git-for-windows/git/releases/download/v2.23.0.windows.1/MinGit-2.23.0-64-bit.zip
+
+ENV GIT_DOWNLOAD_SHA256=8f65208f92c0b4c3ae4c0cf02d4b5f6791d539cd1a07b2df62b7116467724735
+
+RUN Write-Host ('Downloading {0} ...' -f $env:GIT_DOWNLOAD_URL); 	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; 	Invoke-WebRequest -Uri $env:GIT_DOWNLOAD_URL -OutFile 'git.zip'; 		Write-Host ('Verifying sha256 ({0}) ...' -f $env:GIT_DOWNLOAD_SHA256); 	if ((Get-FileHash git.zip -Algorithm sha256).Hash -ne $env:GIT_DOWNLOAD_SHA256) { 		Write-Host 'FAILED!'; 		exit 1; 	}; 		Write-Host 'Expanding ...'; 	Expand-Archive -Path git.zip -DestinationPath C:\git\.; 		Write-Host 'Removing ...'; 	Remove-Item git.zip -Force; 		Write-Host 'Updating PATH ...'; 	$env:PATH = 'C:\git\cmd;C:\git\mingw64\bin;C:\git\usr\bin;' + $env:PATH; 	[Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); 		Write-Host 'Verifying install ("git version") ...'; 	git version; 		Write-Host 'Complete.';
+
+ENV GOPATH=C:\\go
+
+RUN $newPath = ('{0}\bin;C:\Program Files\Go\bin;{1}' -f $env:GOPATH, $env:PATH); 	Write-Host ('Updating PATH: {0}' -f $newPath); 	[Environment]::SetEnvironmentVariable('PATH', $newPath, [EnvironmentVariableTarget]::Machine);
+
+ENV GOLANG_VERSION=1.17.6
+
+RUN $url = 'https://dl.google.com/go/go1.17.6.windows-amd64.zip'; 	Write-Host ('Downloading {0} ...' -f $url); 	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; 	Invoke-WebRequest -Uri $url -OutFile 'go.zip'; 		$sha256 = '5bf8f87aec7edfc08e6bc845f1c30dba6de32b863f89ae46553ff4bbcc1d4954'; 	Write-Host ('Verifying sha256 ({0}) ...' -f $sha256); 	if ((Get-FileHash go.zip -Algorithm sha256).Hash -ne $sha256) { 		Write-Host 'FAILED!'; 		exit 1; 	}; 		Write-Host 'Expanding ...'; 	Expand-Archive go.zip -DestinationPath C:\; 		Write-Host 'Moving ...'; 	Move-Item -Path C:\go -Destination 'C:\Program Files\Go'; 		Write-Host 'Removing ...'; 	Remove-Item go.zip -Force; 		Write-Host 'Verifying install ("go version") ...'; 	go version; 		Write-Host 'Complete.';
 
 COPY . /neo-go