build: set remote origin url

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

util/gitutil/gitutil_test.go

@@ -77,3 +77,89 @@ func TestGitDescribeTags(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, "v0.9.0", out)
 }
+
+func TestGitRemoteURL(t *testing.T) {
+	type remote struct {
+		name string
+		url  string
+	}
+
+	cases := []struct {
+		name     string
+		remotes  []remote
+		expected string
+		fail     bool
+	}{
+		{
+			name:    "no remotes",
+			remotes: []remote{},
+			fail:    true,
+		},
+		{
+			name: "origin",
+			remotes: []remote{
+				{
+					name: "origin",
+					url:  "git@github.com:crazy-max/buildx.git",
+				},
+			},
+			expected: "git@github.com:crazy-max/buildx.git",
+		},
+		{
+			name: "upstream",
+			remotes: []remote{
+				{
+					name: "upstream",
+					url:  "git@github.com:docker/buildx.git",
+				},
+			},
+			expected: "git@github.com:docker/buildx.git",
+		},
+		{
+			name: "origin and upstream",
+			remotes: []remote{
+				{
+					name: "upstream",
+					url:  "git@github.com:docker/buildx.git",
+				},
+				{
+					name: "origin",
+					url:  "git@github.com:crazy-max/buildx.git",
+				},
+			},
+			expected: "git@github.com:crazy-max/buildx.git",
+		},
+		{
+			name: "not found",
+			remotes: []remote{
+				{
+					name: "foo",
+					url:  "git@github.com:docker/buildx.git",
+				},
+			},
+			fail: true,
+		},
+	}
+	for _, tt := range cases {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			Mktmp(t)
+			c, err := New()
+			require.NoError(t, err)
+
+			GitInit(c, t)
+			GitCommit(c, t, "initial commit")
+			for _, r := range tt.remotes {
+				GitSetRemote(c, t, r.name, r.url)
+			}
+
+			ru, err := c.RemoteURL()
+			if tt.fail {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+			require.Equal(t, tt.expected, ru)
+		})
+	}
+}