feat(chart): support 'image:URL' in charts.

Closes #1034

_proto/hapi/chart/metadata.proto

@@ -58,4 +58,7 @@ message Metadata {
 
 	// The name of the template engine to use. Defaults to 'gotpl'.
 	string engine = 8;
+
+	// The URL to an icon file.
+	string icon = 9;
 }

docs/charts.md

@@ -51,6 +51,7 @@ maintainers: # (optional)
   - name: The maintainer's name (required for each maintainer)
     email: The maintainer's email (optional for each maintainer)
 engine: gotpl # The name of the template engine (optional, defaults to gotpl)
+icon: A URL to an SVG or PNG image to be used as an icon (optional).
 ```
 
 If you are familiar with the `Chart.yaml` file format for Helm Classic, you will

pkg/chartutil/chartfile_test.go

@@ -75,6 +75,10 @@ func verifyChartfile(t *testing.T, f *chart.Metadata) {
 		t.Error("Unexpected home.")
 	}
 
+	if f.Icon != "https://example.com/64x64.png" {
+		t.Errorf("Unexpected icon: %q", f.Icon)
+	}
+
 	if len(f.Keywords) != 3 {
 		t.Error("Unexpected keywords")
 	}

pkg/chartutil/testdata/chartfiletest.yaml

@@ -13,3 +13,4 @@ maintainers:
 sources:
   - https://example.com/foo/bar
 home: http://example.com
+icon: https://example.com/64x64.png

pkg/chartutil/testdata/frobnitz/Chart.yaml

@@ -13,3 +13,4 @@ maintainers:
 sources:
   - https://example.com/foo/bar
 home: http://example.com
+icon: https://example.com/64x64.png

pkg/proto/hapi/chart/metadata.pb.go

@@ -67,6 +67,8 @@ type Metadata struct {
 	Maintainers []*Maintainer `protobuf:"bytes,7,rep,name=maintainers" json:"maintainers,omitempty"`
 	// The name of the template engine to use. Defaults to 'gotpl'.
 	Engine string `protobuf:"bytes,8,opt,name=engine" json:"engine,omitempty"`
+	// The URL to an icon file.
+	Icon string `protobuf:"bytes,9,opt,name=icon" json:"icon,omitempty"`
 }
 
 func (m *Metadata) Reset()                    { *m = Metadata{} }
@@ -88,22 +90,23 @@ func init() {
 }
 
 var fileDescriptor2 = []byte{
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 }