feat: add recipe versions command

TODO.md

@@ -33,7 +33,7 @@ Disclaimer!: List is WIP
       - [x] `ls`
       - [ ] `create`
       - [ ] `release`
-      - [ ] `versions`
+      - [x] `versions`
     - [ ] `abra upgrade`
     - [x] `version`
     - [ ] `doctor`

cli/recipe.go

@@ -174,10 +174,46 @@ var recipeListCommand = &cli.Command{
 	},
 }
 
+var recipeVersionCommand = &cli.Command{
+	Name:      "versions",
+	Usage:     "List available versions for <recipe>",
+	ArgsUsage: "<recipe>",
+	Action: func(c *cli.Context) error {
+		recipe := c.Args().First()
+		if recipe == "" {
+			cli.ShowSubcommandHelp(c)
+			return nil
+		}
+
+		apps, err := ReadApps()
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		if app, ok := apps[recipe]; ok {
+			tableCol := []string{"Version", "Service", "Image", "Digest"}
+			table := createTable(tableCol)
+			for version := range app.Versions {
+				for service := range app.Versions[version] {
+					meta := app.Versions[version][service]
+					table.Append([]string{version, service, meta.Image, meta.Digest})
+				}
+			}
+			table.SetAutoMergeCells(true)
+			table.Render()
+			return nil
+		}
+
+		logrus.Fatalf("'%s' recipe doesn't exist?", recipe)
+		return nil
+	},
+}
+
 var RecipeCommand = &cli.Command{
 	Name:     "recipe",
 	HideHelp: true,
 	Subcommands: []*cli.Command{
 		recipeListCommand,
+		recipeVersionCommand,
 	},
 }