Added package checkenv

pkg/checkenv/checkenv.go

@@ -0,0 +1,20 @@
+package checkenv
+
+import "os"
+
+type EnvChecker struct {
+	VariableNames []string
+}
+
+func NewEnvChecker(variableNames []string) *EnvChecker {
+	return &EnvChecker{VariableNames: variableNames}
+}
+
+func (e *EnvChecker) CheckAll() bool {
+	for _, variableName := range e.VariableNames {
+		if _, exists := os.LookupEnv(variableName); !exists {
+			return false
+		}
+	}
+	return true
+}