Bump docs tool to 21 beta #40

	name: Pull request checks

	on:
	pull_request:
	branches:
	- '**'

	env:
	FSHARP_DIR: fsharp

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Checkout fsharp main
	uses: actions/checkout@v4
	with:
	repository: dotnet/fsharp
	path: ${{ env.FSHARP_DIR }}
	ref: main
	- name: Setup .NET for FSharp
	uses: actions/setup-dotnet@v4
	with:
	global-json-file: ${{ env.FSHARP_DIR }}/global.json
	- name: Restore tools
	run: dotnet tool restore
	- name: Restore FSharp.Compiler.Service.fsproj
	run: dotnet restore FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj

	- name: Build FCS
	run: dotnet build FSharp.Compiler.Service.sln
	working-directory: ${{ env.FSHARP_DIR }}

	- name: Run fsdocs
	env:
	# allow roll forward to latest major version - this would happen for us if we invoked the fsdocs tool instead of invoking the binary directly
	DOTNET_ROLL_FORWARD: "LatestMajor"
	# need previews because .NET 8 is what's being used at runtime
	DOTNET_ROLL_FORWARD_TO_PRERELEASE: "1"
	run: dotnet fsdocs build --eval --sourcefolder fsharp --input fsharp/docs

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