Addition of load release summary function

Signed-off-by: Florent Poinsard <florent.poinsard@outlook.fr>

go/tools/release-notes/release_notes.go

@@ -20,6 +20,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -366,6 +367,14 @@ func createSortedPrTypeSlice(prPerType prsByType) []sortedPRType {
 	return data
 }
 
+func releaseSummary(summaryFile string) (string, error) {
+	contentSummary, err := ioutil.ReadFile(summaryFile)
+	if err != nil {
+		return "", err
+	}
+	return string(contentSummary), nil
+}
+
 func getOutput(fileout string) (*os.File, error) {
 	if fileout == "" {
 		return os.Stdout, nil

go/tools/release-notes/release_notes_test.go

@@ -17,6 +17,7 @@ limitations under the License.
 package main
 
 import (
+	"io/ioutil"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -104,3 +105,20 @@ TEST@planetscale.com	docker/lite/install_dependencies.sh:  Upgrade MySQL 8 to 8.
 	assert.Equal(t, authorCommits, []string{"385d0b327", "3b744e782", "4a0a943b0", "538709da5", "616f5562c", "6b9a731a2", "e5242a88a", "edac2baf8"})
 	assert.Equal(t, 28, nonMergeCommits)
 }
+
+func TestLoadSummaryReadme(t *testing.T) {
+	readmeFile, err := ioutil.TempFile("", "*.md")
+	require.NoError(t, err)
+
+	readmeContent := `- New Gen4 feature
+- Self hosted runners
+- Bunch of features
+`
+
+	err = ioutil.WriteFile(readmeFile.Name(), []byte(readmeContent), 0644)
+	require.NoError(t, err)
+
+	str, err := releaseSummary(readmeFile.Name())
+	require.NoError(t, err)
+	require.Equal(t, str, readmeContent)
+}