Create nasm64 executor and test file

lxc/executors/nasm64

@@ -0,0 +1,4 @@
+cd /tmp/$2
+timeout -s KILL 10 nasm -f elf64 -o binary.o code.code
+timeout -s KILL 10 ld -m elf_x86_64 binary.o -o binary
+runuser runner$1 -c "cd /tmp/$2 ; cat args.args | xargs -d '\n' timeout -s KILL 3 ./binary"

lxc/tests/test64.nasm

@@ -0,0 +1,18 @@
+SECTION .data
+	good:	db "good", 0x0a, 0x0
+	txtlen:	equ $ - good
+
+SECTION .text
+GLOBAL _start
+
+_start:
+	;sys_write
+	mov rax, 1
+	mov rdi, 1
+	mov rsi, good
+	mov rdx, txtlen
+	syscall
+	;sys_exit
+	mov rax, 60
+	mov rdi, 0
+	syscall