Duplicated progress env var

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

commands/build.go

@@ -352,13 +352,7 @@ func buildCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 
 func commonBuildFlags(options *commonOptions, flags *pflag.FlagSet) {
 	options.noCache = flags.Bool("no-cache", false, "Do not use cache when building the image")
-
-	defaultProgress, ok := os.LookupEnv("BUILDX_PROGRESS_DEFAULT")
-	if !ok {
-		defaultProgress = "auto"
-	}
-	flags.StringVar(&options.progress, "progress", defaultProgress, "Set type of progress output (auto, plain, tty). Use plain to show container output")
-
+	flags.StringVar(&options.progress, "progress", "auto", "Set type of progress output (auto, plain, tty). Use plain to show container output")
 	options.pull = flags.Bool("pull", false, "Always attempt to pull a newer version of the image")
 	flags.StringVar(&options.metadataFile, "metadata-file", "", "Write build result metadata to the file")
 }

docs/reference/buildx_bake.md

@@ -115,8 +115,10 @@ $ docker buildx bake -f docker-bake.hcl --print db
 
 ### <a name="progress"></a> Set type of progress output (--progress)
 
-Same as `build --progress`. Set type of progress output (auto, plain, tty). Use
-plain to show container output (default "auto").
+Same as [`build --progress`](buildx_build.md#progress). Set type of progress
+output (auto, plain, tty). Use plain to show container output (default "auto").
+
+> You can also use the `BUILDKIT_PROGRESS` environment variable to set its value.
 
 The following example uses `plain` output during the build:
 

docs/reference/buildx_build.md

@@ -30,7 +30,7 @@ Start a build
 | `--no-cache` | Do not use cache when building the image |
 | [`-o`](#output), [`--output stringArray`](#output) | Output destination (format: type=local,dest=path) |
 | [`--platform stringArray`](#platform) | Set target platform for build |
-| `--progress string` | Set type of progress output (auto, plain, tty). Use plain to show container output |
+| [`--progress string`](#progress) | Set type of progress output (auto, plain, tty). Use plain to show container output |
 | `--pull` | Always attempt to pull a newer version of the image |
 | [`--push`](#push) | Shorthand for --output=type=registry |
 | `--secret stringArray` | Secret file to expose to the build: id=mysecret,src=/local/secret |
@@ -93,6 +93,33 @@ $ docker buildx build --platform=linux/amd64,linux/arm64,linux/arm/v7 .
 $ docker buildx build --platform=darwin .
 ```
 
+### <a name="progress"></a> Set type of progress output (--progress)
+
+```
+--progress=VALUE
+```
+
+Set type of progress output (auto, plain, tty). Use plain to show container
+output (default "auto").
+
+> You can also use the `BUILDKIT_PROGRESS` environment variable to set
+> its value.
+
+The following example uses `plain` output during the build:
+
+```console
+$ docker buildx build --load --progress=plain .
+
+#1 [internal] load build definition from Dockerfile
+#1 transferring dockerfile: 227B 0.0s done
+#1 DONE 0.1s
+
+#2 [internal] load .dockerignore
+#2 transferring context: 129B 0.0s done
+#2 DONE 0.0s
+...
+```
+
 ### <a name="output"></a> Set the export action for the build result (-o, --output)
 
 ```