tests: Add github actions cache

Signed-off-by: Brian Goff <[email protected]>

test/testenv/buildkit.go

@@ -1,8 +1,10 @@
 package testenv
 
 import (
+	"os"
 	"strconv"
 	"strings"
+	"testing"
 
 	"github.com/moby/buildkit/client"
 )
@@ -61,3 +63,24 @@ func isSupported(info *client.Info) bool {
 
 	return minor >= minVersion.Minor
 }
+
+func withGHCache(t *testing.T, so *client.SolveOpt) {
+	if os.Getenv("GITHUB_ACTIONS") != "true" {
+		return
+	}
+
+	scope := "test-integration-" + t.Name()
+	so.CacheExports = append(so.CacheExports, client.CacheOptionsEntry{
+		Type: "gha",
+		Attrs: map[string]string{
+			"scope": scope,
+			"mode":  "max",
+		},
+	})
+	so.CacheImports = append(so.CacheImports, client.CacheOptionsEntry{
+		Type: "gha",
+		Attrs: map[string]string{
+			"scope": scope,
+		},
+	})
+}

test/testenv/buildx.go

@@ -226,6 +226,7 @@ func (b *BuildxEnv) RunTest(ctx context.Context, t *testing.T, f gwclient.BuildF
 
 	var so client.SolveOpt
 	withProjectRoot(t, &so)
+	withGHCache(t, &so)
 
 	_, err = c.Build(ctx, so, "", func(ctx context.Context, gwc gwclient.Client) (*gwclient.Result, error) {
 		gwc = &clientForceDalecWithInput{gwc}