feat(config): add environment variable support for all taskrc options (#2607)

internal/env/env.go

@@ -3,7 +3,9 @@ package env
 import (
 	"fmt"
 	"os"
+	"strconv"
 	"strings"
+	"time"
 
 	"github.com/go-task/task/v3/experiments"
 	"github.com/go-task/task/v3/taskfile/ast"
@@ -61,3 +63,63 @@ func isTypeAllowed(v any) bool {
 func GetTaskEnv(key string) string {
 	return os.Getenv(taskVarPrefix + key)
 }
+
+// GetTaskEnvBool returns the boolean value of a TASK_ prefixed env var.
+// Returns the value and true if set and valid, or false and false if not set or invalid.
+func GetTaskEnvBool(key string) (bool, bool) {
+	v := GetTaskEnv(key)
+	if v == "" {
+		return false, false
+	}
+	b, err := strconv.ParseBool(v)
+	return b, err == nil
+}
+
+// GetTaskEnvInt returns the integer value of a TASK_ prefixed env var.
+// Returns the value and true if set and valid, or 0 and false if not set or invalid.
+func GetTaskEnvInt(key string) (int, bool) {
+	v := GetTaskEnv(key)
+	if v == "" {
+		return 0, false
+	}
+	i, err := strconv.Atoi(v)
+	return i, err == nil
+}
+
+// GetTaskEnvDuration returns the duration value of a TASK_ prefixed env var.
+// Returns the value and true if set and valid, or 0 and false if not set or invalid.
+func GetTaskEnvDuration(key string) (time.Duration, bool) {
+	v := GetTaskEnv(key)
+	if v == "" {
+		return 0, false
+	}
+	d, err := time.ParseDuration(v)
+	return d, err == nil
+}
+
+// GetTaskEnvString returns the string value of a TASK_ prefixed env var.
+// Returns the value and true if set (non-empty), or empty string and false if not set.
+func GetTaskEnvString(key string) (string, bool) {
+	v := GetTaskEnv(key)
+	return v, v != ""
+}
+
+// GetTaskEnvStringSlice returns a comma-separated list from a TASK_ prefixed env var.
+// Returns the slice and true if set (non-empty), or nil and false if not set.
+func GetTaskEnvStringSlice(key string) ([]string, bool) {
+	v := GetTaskEnv(key)
+	if v == "" {
+		return nil, false
+	}
+	parts := strings.Split(v, ",")
+	result := make([]string, 0, len(parts))
+	for _, p := range parts {
+		if trimmed := strings.TrimSpace(p); trimmed != "" {
+			result = append(result, trimmed)
+		}
+	}
+	if len(result) == 0 {
+		return nil, false
+	}
+	return result, true
+}