feat: tag with latest

.vscode/extensions.json

@@ -0,0 +1,3 @@
+{
+  "recommendations": ["golang.go"]
+}

internal/options/helper.go

@@ -12,3 +12,16 @@ func readBoolOption(key string) (bool, error) {
 	}
 	return strconv.ParseBool(o)
 }
+
+// OptionalBool enum
+type OptionalBool int
+
+const (
+	notPresent OptionalBool = iota
+	presentAndFalse
+	presentAndTrue
+)
+
+func (d OptionalBool) String() string {
+	return [...]string{"notPresent", "presentAndFalse", "presentAndTrue"}[d]
+}

internal/options/tag.go

@@ -8,8 +8,9 @@ import (
 )
 
 var (
-	errTagWithRefParse = errors.New("tag_with_ref input must be a valid boolean value")
-	errTagWithShaParse = errors.New("tag_with_sha input must be a valid boolean value")
+	errTagWithRefParse    = errors.New("tag_with_ref input must be a valid boolean value")
+	errTagWithShaParse    = errors.New("tag_with_sha input must be a valid boolean value")
+	errTagWithLatestParse = errors.New("tag_with_latest input must be a valid boolean value")
 )
 
 func tagWithRef() (bool, error) {
@@ -28,6 +29,21 @@ func tagWithSha() (bool, error) {
 	return b, nil
 }
 
+func tagWithLatest() (OptionalBool, error) {
+	var key = "INPUT_TAG_WITH_LATEST"
+	if _, present := os.LookupEnv(key); !present {
+		return notPresent, nil
+	}
+	b, err := readBoolOption(key)
+	if err != nil {
+		return notPresent, errTagWithLatestParse
+	}
+	if b {
+		return presentAndTrue, nil
+	}
+	return presentAndFalse, nil
+}
+
 func dockerRepo(github GitHub) string {
 	if repo := os.Getenv("INPUT_REPOSITORY"); repo != "" {
 		return repo
@@ -57,12 +73,18 @@ func GetTags(registry string, github GitHub) ([]string, error) {
 	for _, t := range staticTags() {
 		tags = append(tags, toFullTag(registry, repo, t))
 	}
+	withLatest, err := tagWithLatest()
+	if err != nil {
+		return nil, err
+	} else if withLatest == presentAndTrue {
+		tags = append(tags, toFullTag(registry, repo, "latest"))
+	}
 	if withRef, err := tagWithRef(); err != nil {
 		return nil, err
 	} else if withRef {
 		switch github.Reference.Type {
 		case GitRefHead:
-			if github.Reference.Name == "master" {
+			if withLatest == notPresent && github.Reference.Name == "master" {
 				tags = append(tags, toFullTag(registry, repo, "latest"))
 			} else {
 				tags = appendGitRefTag(tags, registry, repo, github.Reference.Name)

internal/options/tag_test.go

@@ -10,14 +10,15 @@ import (
 
 func TestGetTags(t *testing.T) {
 	testCases := []struct {
-		name       string
-		tagWithRef bool
-		tagWithSha bool
-		tags       string
-		ref        GitReference
-		registry   string
-		expected   []string
-		sha        string
+		name          string
+		tagWithRef    bool
+		tagWithSha    bool
+		tagWithLatest OptionalBool
+		tags          string
+		ref           GitReference
+		registry      string
+		expected      []string
+		sha           string
 	}{
 		{
 			name:     "no-standard-tags",
@@ -46,6 +47,36 @@ func TestGetTags(t *testing.T) {
 			expected:   []string{"my/repo:tag1", "my/repo:tag2", "my/repo:latest"},
 			ref:        GitReference{GitRefHead, "master"},
 		},
+		{
+			name:          "latest-true",
+			tags:          "tag1,tag2",
+			tagWithLatest: presentAndTrue,
+			expected:      []string{"my/repo:tag1", "my/repo:tag2", "my/repo:latest"},
+			ref:           GitReference{GitRefHead, "master"},
+		},
+		{
+			name:          "latest-false",
+			tags:          "tag1,tag2",
+			tagWithLatest: presentAndFalse,
+			expected:      []string{"my/repo:tag1", "my/repo:tag2"},
+			ref:           GitReference{GitRefHead, "master"},
+		},
+		{
+			name:          "master-branch-latest-true",
+			tagWithRef:    true,
+			tags:          "tag1,tag2",
+			tagWithLatest: presentAndTrue,
+			expected:      []string{"my/repo:tag1", "my/repo:tag2", "my/repo:latest", "my/repo:master"},
+			ref:           GitReference{GitRefHead, "master"},
+		},
+		{
+			name:          "master-branch-latest-false",
+			tagWithRef:    true,
+			tags:          "tag1,tag2",
+			tagWithLatest: presentAndFalse,
+			expected:      []string{"my/repo:tag1", "my/repo:tag2", "my/repo:master"},
+			ref:           GitReference{GitRefHead, "master"},
+		},
 		{
 			name:       "different-branch",
 			tagWithRef: true,
@@ -99,10 +130,18 @@ func TestGetTags(t *testing.T) {
 			defer os.Unsetenv("INPUT_REPOSITORY")
 			defer os.Unsetenv("INPUT_TAG_WITH_REF")
 			defer os.Unsetenv("INPUT_TAG_WITH_SHA")
+			defer os.Unsetenv("INPUT_TAG_WITH_LATEST")
 			_ = os.Setenv("INPUT_TAGS", tc.tags)
 			_ = os.Setenv("INPUT_REPOSITORY", "my/repo")
 			_ = os.Setenv("INPUT_TAG_WITH_REF", fmt.Sprint(tc.tagWithRef))
 			_ = os.Setenv("INPUT_TAG_WITH_SHA", fmt.Sprint(tc.tagWithSha))
+			if tc.tagWithLatest == presentAndTrue || tc.tagWithLatest == presentAndFalse {
+				if tc.tagWithLatest == presentAndTrue {
+					_ = os.Setenv("INPUT_TAG_WITH_LATEST", fmt.Sprint(true))
+				} else {
+					_ = os.Setenv("INPUT_TAG_WITH_LATEST", fmt.Sprint(false))
+				}
+			}
 
 			tags, err := GetTags(
 				tc.registry,