add linux arm64 binary and linuxbrew formula

[joemiller]

No description provided.

[joemiller]

this might be a little more work. ci failing:

⨯ release failed after 92.78s error=failed to build for linux_arm64: exit status 2: go: downloading github.com/godbus/dbus v4.1.0+incompatible
go: downloading github.com/gsterjov/go-libsecret v0.0.0-20161001094733-a6f4afe4910c
# runtime/cgo
gcc_arm64.S: Assembler messages:
gcc_arm64.S:28: Error: no such instruction: `stp x29,x30,[sp,'
gcc_arm64.S:32: Error: too many memory references for `mov'
gcc_arm64.S:34: Error: no such instruction: `stp x19,x20,[sp,'
gcc_arm64.S:37: Error: no such instruction: `stp x21,x22,[sp,'
gcc_arm64.S:40: Error: no such instruction: `stp x23,x24,[sp,'
gcc_arm64.S:43: Error: no such instruction: `stp x25,x26,[sp,'
gcc_arm64.S:46: Error: no such instruction: `stp x27,x28,[sp,'
gcc_arm64.S:50: Error: too many memory references for `mov'
gcc_arm64.S:51: Error: too many memory references for `mov'
gcc_arm64.S:52: Error: too many memory references for `mov'
gcc_arm64.S:54: Error: no such instruction: `blr x20'
gcc_arm64.S:55: Error: no such instruction: `blr x19'
gcc_arm64.S:57: Error: no such instruction: `ldp x27,x28,[sp,'
gcc_arm64.S:[60](https://github.com/joemiller/vault-token-helper/runs/5369792400?check_suite_focus=true#step:9:60): Error: no such instruction: `ldp x25,x26,[sp,'
gcc_arm64.S:[63](https://github.com/joemiller/vault-token-helper/runs/5369792400?check_suite_focus=true#step:9:63): Error: no such instruction: `ldp x23,x24,[sp,'
gcc_arm[64](https://github.com/joemiller/vault-token-helper/runs/5369792400?check_suite_focus=true#step:9:64).S:[66](https://github.com/joemiller/vault-token-helper/runs/5369792400?check_suite_focus=true#step:9:66): Error: no such instruction: `ldp x21,x22,[sp,'
gcc_arm64.S:[69](https://github.com/joemiller/vault-token-helper/runs/5369792400?check_suite_focus=true#step:9:69): Error: no such instruction: `ldp x19,x20,[sp,'
gcc_arm64.S:[72](https://github.com/joemiller/vault-token-helper/runs/5369792400?check_suite_focus=true#step:9:72): Error: no such instruction: `ldp x29,x30,[sp],'

[n3ph]

This would be very appreciated!