Harden CI and switch release builds to tagged immutable images

internal/config/config_test.go

@@ -0,0 +1,18 @@
+package config
+
+import (
+	"log/slog"
+	"testing"
+)
+
+func TestParseLogLevel(t *testing.T) {
+	t.Parallel()
+
+	level, err := parseLogLevel("warning")
+	if err != nil {
+		t.Fatalf("parseLogLevel returned an error: %v", err)
+	}
+	if level != slog.LevelWarn {
+		t.Fatalf("parseLogLevel = %v, want %v", level, slog.LevelWarn)
+	}
+}