fix unit test failures in GitHub Actions caused by missing gitconfig

.github/actions/check/Dockerfile

@@ -1,5 +1,7 @@
 FROM golangci/golangci-lint:v1.12.5
 
+RUN apt-get install git
+
 LABEL "com.github.actions.name"="Check"
 LABEL "com.github.actions.description"="Run static analysis and unit tests"
 LABEL "com.github.actions.icon"="check-circle"
@@ -9,4 +11,4 @@ COPY "entrypoint.sh" "/entrypoint.sh"
 RUN chmod +x /entrypoint.sh
 
 ENV GOFLAGS -mod=vendor
-ENTRYPOINT ["/entrypoint.sh"]
+ENTRYPOINT ["/entrypoint.sh"]

common/git_test.go

@@ -1,7 +1,6 @@
 package common
 
 import (
-	"bytes"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -14,6 +13,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+
 func TestFindGitSlug(t *testing.T) {
 	assert := assert.New(t)
 
@@ -51,6 +51,7 @@ func TestFindGitRemoteURL(t *testing.T) {
 
 	assert.Nil(err)
 
+  gitConfig()
 	err = gitCmd("init", basedir)
 	assert.Nil(err)
 
@@ -68,6 +69,8 @@ func TestGitFindRef(t *testing.T) {
 	defer os.RemoveAll(basedir)
 	assert.NoError(t, err)
 
+  gitConfig()
+
 	for name, tt := range map[string]struct {
 		Prepare func(t *testing.T, dir string)
 		Assert  func(t *testing.T, ref string, err error)
@@ -143,11 +146,15 @@ func TestGitFindRef(t *testing.T) {
 	}
 }
 
+func gitConfig() {
+	_ = gitCmd("config","--global","user.email","test@test.com")
+	_ = gitCmd("config","--global","user.name","Unit Test")
+}
+
 func gitCmd(args ...string) error {
-	var stdout bytes.Buffer
 	cmd := exec.Command("git", args...)
-	cmd.Stdout = &stdout
-	cmd.Stderr = ioutil.Discard
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
 
 	err := cmd.Run()
 	if exitError, ok := err.(*exec.ExitError); ok {