Use resolved bindir in cmd installer PATH

tests/release_scripts.rs

@@ -257,9 +257,14 @@ fn windows_cmd_installer_wraps_native_powershell_installer() {
     assert!(cmd.contains("@echo off"));
     assert!(cmd.contains("https://git.palav.dev/Palav/dosh/raw/branch/main/install.ps1"));
     assert!(cmd.contains("for %%P in (powershell.exe pwsh.exe powershell pwsh) do"));
+    assert!(cmd.contains("set \"TMP_BINDIR=%TEMP%\\dosh-install-%RANDOM%-%RANDOM%.bindir\""));
+    assert!(cmd.contains("set \"DOSH_INSTALL_BINDIR_FILE=%TMP_BINDIR%\""));
     assert!(cmd.contains("Invoke-WebRequest -UseBasicParsing"));
     assert!(cmd.contains("-ExecutionPolicy Bypass -File \"%TMP_PS%\" %*"));
-    assert!(cmd.contains("set \"DOSH_CMD_PREFIX=%PREFIX%\""));
+    assert!(cmd.contains(
+        "for /f \"usebackq delims=\" %%D in (\"%TMP_BINDIR%\") do if not defined DOSH_CMD_BINDIR set \"DOSH_CMD_BINDIR=%%D\""
+    ));
+    assert!(cmd.contains("if not defined DOSH_CMD_BINDIR ("));
     assert!(
         cmd.contains(
             "if \"%DOSH_CMD_PREFIX%\"==\"\" set \"DOSH_CMD_PREFIX=%USERPROFILE%\\.local\""
@@ -363,6 +368,9 @@ fn windows_installer_adds_user_path_idempotently() {
     let ps1 = include_str!("../install.ps1");
     assert!(ps1.contains("function Add-UserPath($PathToAdd)"));
     assert!(ps1.contains("function PathList-Contains($PathValue, $PathToFind)"));
+    assert!(ps1.contains("$bindir = Normalize-PathForCompare (Join-Path $Prefix \"bin\")"));
+    assert!(ps1.contains("if ($env:DOSH_INSTALL_BINDIR_FILE)"));
+    assert!(ps1.contains("Write-Utf8NoBom $env:DOSH_INSTALL_BINDIR_FILE $bindir"));
     assert!(ps1.contains("$wanted = Normalize-PathForCompare $PathToFind"));
     assert!(ps1.contains("foreach ($entry in ($PathValue -split ';' | Where-Object { $_ }))"));
     assert!(ps1.contains("$wanted = Normalize-PathForCompare $PathToAdd"));