feat: auto generate example env file (#647)

* feat: auto generate example env file

* refactor: simplify build paths func and better slice handling

* chore: forgot to stage everything

* chore: review comments

* refactor: remove square brackets because they mess up the syntax
highlighting

* refactor: use lowercase name to mark dynamic values

gen/gen.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"log/slog"
+)
+
+func main() {
+	slog.Info("generating example env file")
+
+	generateExampleEnv()
+}