Harden CI and switch release builds to tagged immutable images

internal/config/config.go

@@ -0,0 +1,55 @@
+package config
+
+import (
+	"fmt"
+	"log/slog"
+	"os"
+	"strings"
+)
+
+type Config struct {
+	HTTPAddress     string
+	WebRoot         string
+	StorageRoot     string
+	PreviewCacheDir string
+	DatabaseURL     string
+	LogLevel        slog.Level
+}
+
+func FromEnvironment() (Config, error) {
+	level, err := parseLogLevel(environment("DRIVE_LOG_LEVEL", "info"))
+	if err != nil {
+		return Config{}, err
+	}
+
+	return Config{
+		HTTPAddress:     environment("DRIVE_HTTP_ADDRESS", ":8080"),
+		WebRoot:         environment("DRIVE_WEB_ROOT", "web/dist"),
+		StorageRoot:     environment("DRIVE_STORAGE_ROOT", "/storage/.drive"),
+		PreviewCacheDir: environment("DRIVE_PREVIEW_CACHE_ROOT", "/cache/previews"),
+		DatabaseURL:     os.Getenv("DRIVE_DATABASE_URL"),
+		LogLevel:        level,
+	}, nil
+}
+
+func environment(name, fallback string) string {
+	if value := strings.TrimSpace(os.Getenv(name)); value != "" {
+		return value
+	}
+	return fallback
+}
+
+func parseLogLevel(value string) (slog.Level, error) {
+	switch strings.ToLower(value) {
+	case "debug":
+		return slog.LevelDebug, nil
+	case "info":
+		return slog.LevelInfo, nil
+	case "warn", "warning":
+		return slog.LevelWarn, nil
+	case "error":
+		return slog.LevelError, nil
+	default:
+		return 0, fmt.Errorf("invalid DRIVE_LOG_LEVEL %q", value)
+	}
+}