qemu: LIMA_QEMU_UEFI_IN_BIOS -> _LIMA_QEMU_UEF_IN_BIOS

Partial cherry-pick of 0705db1
(PR 3347) from the master branch.

This is not a breaking change, as there is still no release
that supports `LIMA_QEMU_UEFI_IN_BIOS`.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Author: AkihiroSuda

pkg/qemu/qemu.go

@@ -603,10 +603,10 @@ func Cmdline(ctx context.Context, cfg Config) (exe string, args []string, err er
 	if !legacyBIOS {
 		var firmware string
 		firmwareInBios := runtime.GOOS == "windows"
-		if envVar := os.Getenv("LIMA_QEMU_UEFI_IN_BIOS"); envVar != "" {
-			b, err := strconv.ParseBool(os.Getenv("LIMA_QEMU_UEFI_IN_BIOS"))
+		if envVar := os.Getenv("_LIMA_QEMU_UEFI_IN_BIOS"); envVar != "" {
+			b, err := strconv.ParseBool(os.Getenv("_LIMA_QEMU_UEFI_IN_BIOS"))
 			if err != nil {
-				logrus.WithError(err).Warnf("invalid LIMA_QEMU_UEFI_IN_BIOS value %q", envVar)
+				logrus.WithError(err).Warnf("invalid _LIMA_QEMU_UEFI_IN_BIOS value %q", envVar)
 			} else {
 				firmwareInBios = b
 			}

website/content/en/docs/config/environment-variables.md

@@ -67,13 +67,13 @@ This page documents the environment variables used in Lima.
   export LIMA_USERNET_RESOLVE_IP_ADDRESS_TIMEOUT=5
   ```
 
-### `LIMA_QEMU_UEFI_IN_BIOS`
+### `_LIMA_QEMU_UEFI_IN_BIOS`
 
 - **Description**: Commands QEMU to load x86_64 UEFI images using `-bios` instead of `pflash` drives.
 - **Default**: `false` on Unix like hosts and `true` on Windows hosts
 - **Usage**: 
   ```sh
-  export LIMA_QEMU_UEFI_IN_BIOS=true
+  export _LIMA_QEMU_UEFI_IN_BIOS=true
   ```
 - **Note**: It is expected that this variable will be set to `false` by default in future
   when QEMU supports `pflash` UEFI for accelerated guests on Windows.