Add some config through flag/env

config/env.go

@@ -0,0 +1,21 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+// FromEnv analyzes all the environment variables to find each one
+// starting by MINIFAAS_
+func (c *Config) FromEnv() error {
+	for _, line := range os.Environ() {
+		if strings.HasPrefix(line, "MINIFAAS_") {
+			err := c.parseLine(line)
+			if err != nil {
+				return fmt.Errorf("error in environment (%q): %w", line, err)
+			}
+		}
+	}
+	return nil
+}