docs: fix buildkit config documentation

.dictionary

@@ -9,7 +9,7 @@ config
 dockerfile
 og
 gzip
-json
+toml
 config
 host:ip
 drone-docker-buildx

_docs/data/data.yaml

@@ -72,7 +72,19 @@ properties:
     required: false
 
   - name: buildkit_config
-    description: Content of the docker buildkit json config.
+    description: |
+      Content of the docker buildkit toml [config](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md). Example:
+
+      ```TOML
+        - name: Build
+        image: thegeeklab/drone-docker-buildx:20
+        settings:
+          repo: example/repo
+          buildkit_config: |
+          [registry."registry.local:30081"]
+            http = true
+            insecure = true
+      ```
     type: string
     defaultValue: false
     required: false

cmd/drone-docker-buildx/config.go

@@ -109,7 +109,7 @@ func settingsFlags(settings *plugin.Settings, category string) []cli.Flag {
 		&cli.StringFlag{
 			Name:        "daemon.buildkit-config",
 			EnvVars:     []string{"PLUGIN_BUILDKIT_CONFIG"},
-			Usage:       "content of the docker buildkit json config",
+			Usage:       "content of the docker buildkit toml config",
 			Destination: &settings.Daemon.BuildkitConfig,
 			Category:    category,
 		},

plugin/daemon.go

@@ -9,7 +9,7 @@ const (
 	dockerExe      = "/usr/local/bin/docker"
 	dockerdExe     = "/usr/local/bin/dockerd"
 	dockerHome     = "/root/.docker/"
-	buildkitConfig = "/tmp/buildkit.json"
+	buildkitConfig = "/tmp/buildkit.toml"
 )
 
 func (p Plugin) startDaemon() {

plugin/impl.go

@@ -146,7 +146,7 @@ func (p *Plugin) Execute() error {
 	if p.settings.Daemon.BuildkitConfig != "" {
 		err := os.WriteFile(buildkitConfig, []byte(p.settings.Daemon.BuildkitConfig), 0o600)
 		if err != nil {
-			return fmt.Errorf("error writing buildkit.json: %s", err)
+			return fmt.Errorf("error writing buildkit.toml: %s", err)
 		}
 	}