Remove jail binary from git tracking and add to .gitignore (#25)

Co-authored-by: blink-so[bot] <211532188+blink-so[bot]@users.noreply.github.com>
Co-authored-by: f0ssel <[email protected]>

Author: blink-so[bot]

.gitignore

@@ -45,3 +45,6 @@ Thumbs.db
 *.crt
 *.key
 build/
+
+# Jail binary
+./jail