feat: allow the selection of a release version with installer

[XavierChanth]

- What I did

Added a --version flag and the string validation necessary in order to select a particular release when installing.

- How I did it

- How to verify it
See my comment below which provides the output of me switching versions.

- Description for the changelog
feat: allow the selection of a release version with installer

[XavierChanth]

sshnoports on  install-version [$+] took 10s 
➜ ./packages/sshnoports/scripts/install_sshnp -c xavierchanth -d xchan -h am -v 3.3.0

Downloading sshnp from https://github.com/atsign-foundation/sshnoports/releases/download/v3.3.0/sshnp-macos-arm64.zip
Installed binaries: sshnp at_activate sshrv
/Users/chant/.ssh/sshnp@xchan already exists.
Overwrite (y/n)? y
Installing sshnp@xchan to /Users/chant/.local/bin/sshnp@xchan


Installation complete!

sshnoports on  install-version [$+] took 5s 
➜ sshnp
Version : 3.3.0
-k, --key-file             Sending atSign's atKeys file if not in ~/.atsign/keys/
-f, --from (mandatory)     Sending atSign
-t, --to (mandatory)       Send a notification to this atSign
-d, --device               Send a notification to this device
                           (defaults to "default")
-h, --host (mandatory)     atSign of sshrvd daemon or FQDN/IP address to connect back to 
-p, --port                 TCP port to connect back to (only required if --host specified a FQDN/IP)
                           (defaults to "22")
-l, --local-port           Reverse ssh port to listen on, on your local machine, by sshnp default finds a spare port
                           (defaults to "0")
-s, --ssh-public-key       Public key file from ~/.ssh to be appended to authorized_hosts on the remote device
                           (defaults to "false")
-o, --local-ssh-options    Add these commands to the local ssh command
-v, --[no-]verbose         More logging
-r, --[no-]rsa             Use RSA 4096 keys rather than the default ED25519 keys
Invalid argument(s): Option from is mandatory.

sshnoports on  install-version [$+] 
➜ ./packages/sshnoports/scripts/install_sshnp -c xavierchanth -d xchan -h am -v 3.2.0

Downloading sshnp from https://github.com/atsign-foundation/sshnoports/releases/download/v3.2.0/sshnp-macos-arm64.zip
Installed binaries: sshnp at_activate sshrv
/Users/chant/.ssh/sshnp@xchan already exists.
Overwrite (y/n)? y
Installing sshnp@xchan to /Users/chant/.local/bin/sshnp@xchan


Installation complete!

sshnoports on  install-version [$+] took 4s 
➜ sshnp                                                                              
Version : 3.2.0
-k, --key-file             Sending atSign's atKeys file if not in ~/.atsign/keys/
-f, --from (mandatory)     Sending atSign
-t, --to (mandatory)       Send a notification to this atSign
-d, --device               Send a notification to this device
                           (defaults to "default")
-h, --host (mandatory)     atSign of sshrvd daemon or FQDN/IP address to connect back to 
-p, --port                 TCP port to connect back to (only required if --host specified a FQDN/IP)
                           (defaults to "22")
-l, --local-port           Reverse ssh port to listen on, on your local machine, by sshnp default finds a spare port
                           (defaults to "0")
-s, --ssh-public-key       Public key file from ~/.ssh to be appended to authorized_hosts on the remote device
                           (defaults to "false")
-o, --local-ssh-options    Add these commands to the local ssh command
-v, --[no-]verbose         More logging
-r, --[no-]rsa             Use RSA 4096 keys rather than the default ED25519 keys
Invalid argument(s): Option from is mandatory.

[XavierChanth]

And of course, no -v selects the latest (which is currently 3.3.0):

sshnoports on  install-version [$+] 
➜ ./packages/sshnoports/scripts/install_sshnp -c xavierchanth -d xchan -h am         

Downloading sshnp from https://github.com/atsign-foundation/sshnoports/releases/download/v3.3.0/sshnp-macos-arm64.zip
Installed binaries: sshnp at_activate sshrv
/Users/chant/.ssh/sshnp@xchan already exists.
Overwrite (y/n)? y
Installing sshnp@xchan to /Users/chant/.local/bin/sshnp@xchan

sshnoports on  install-version [$] took 10s 
➜ sshnp
Version : 3.3.0
-k, --key-file             Sending atSign's atKeys file if not in ~/.atsign/keys/
-f, --from (mandatory)     Sending atSign
-t, --to (mandatory)       Send a notification to this atSign
-d, --device               Send a notification to this device
                           (defaults to "default")
-h, --host (mandatory)     atSign of sshrvd daemon or FQDN/IP address to connect back to 
-p, --port                 TCP port to connect back to (only required if --host specified a FQDN/IP)
                           (defaults to "22")
-l, --local-port           Reverse ssh port to listen on, on your local machine, by sshnp default finds a spare port
                           (defaults to "0")
-s, --ssh-public-key       Public key file from ~/.ssh to be appended to authorized_hosts on the remote device
                           (defaults to "false")
-o, --local-ssh-options    Add these commands to the local ssh command
-v, --[no-]verbose         More logging
-r, --[no-]rsa             Use RSA 4096 keys rather than the default ED25519 keys
Invalid argument(s): Option from is mandatory.