Dockerfile provider (#329)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

internal/provider/dockerfile/dockerfile.go

@@ -0,0 +1,49 @@
+package dockerfile
+
+import (
+	"github.com/crazy-max/diun/v4/internal/model"
+	"github.com/crazy-max/diun/v4/internal/provider"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+)
+
+// Client represents an active dockerfile provider object
+type Client struct {
+	*provider.Client
+	config *model.PrdDockerfile
+	logger zerolog.Logger
+}
+
+// New creates new dockerfile provider instance
+func New(config *model.PrdDockerfile) *provider.Client {
+	return &provider.Client{
+		Handler: &Client{
+			config: config,
+			logger: log.With().Str("provider", "dockerfile").Logger(),
+		},
+	}
+}
+
+// ListJob returns job list to process
+func (c *Client) ListJob() []model.Job {
+	if c.config == nil {
+		return []model.Job{}
+	}
+
+	images := c.listExtImage()
+	if len(images) == 0 {
+		log.Warn().Msg("No image found")
+		return []model.Job{}
+	}
+
+	c.logger.Info().Msgf("Found %d image(s) to analyze", len(images))
+	var list []model.Job
+	for _, image := range images {
+		list = append(list, model.Job{
+			Provider: "dockerfile",
+			Image:    image,
+		})
+	}
+
+	return list
+}