fix(lib): decompression on windows

* Decompression on windows failed since the `Start-Process` cmdlet exited
  immediately after spawning the process. Fixed by including the `-Wait`
  argument.
* We were using `unzip` on all platforms, and it does not exist on
  Windows. Instead, now we use the `Expand-Archive` cmdlet for
  decompression on windows.

toolchainlib/src/compression.luau

@@ -58,9 +58,13 @@ local decompress: { [CompressionFormat]: (compressed: buffer) -> Result<pathfs.A
 				pathfs.writeDir(decompressedDir)
 
 				-- Run unzip to decompress the file
-				local child = CommandBuilder
-					.new("unzip")
-					:withArgs({ tmpFilePath, "-d", decompressedDir:toString() })
+				local child = (if process.os == "windows"
+					-- Thanks windows :)
+					then CommandBuilder.new("powershell"):withArgs({
+						"-ExecutionPolicy RemoteSigned",
+						`-c \`"Import-Module Microsoft.PowerShell.Archive; Expand-Archive -LiteralPath '{tmpFilePath}' -DestinationPath '{decompressedDir:toString()}'\`"`,
+					})
+					else CommandBuilder.new("unzip"):withArgs({ tmpFilePath, "-d", decompressedDir:toString() }))
 					-- FIXME: remove unknown usage
 					:withStdioStrategy({
 						stdout = Option.Some("pipe" :: CommandBuilder.StdioStrategy) :: Option<unknown>,

toolchainlib/src/utils/exec.luau

@@ -120,7 +120,7 @@ function CommandBuilder.intoChildProcess(self: CommandBuilder): ChildProcess
 			for _ = 0, retries do
 				local spawned = process.spawn(
 					if process.os == "windows"
-						then `(Start-Process {self.program} -Passthru -NoNewWindow -ArgumentList \"{argsList}\").Id`
+						then `(Start-Process {self.program} -Passthru -Wait -ExecutionPolicy Bypass -NoNewWindow -ArgumentList \"{argsList}\").Id`
 						else `{self.program} {argsList} & echo $!`,
 					{},
 					{