Use a single `--` instead of needing double `--` to separate commands

[aryanjassal]

Description

Previously, we needed to use two -- to separate commands from arguments. Now, that is no longer needed, and we can use a single -- to parse arguments.

polykey secrets env vault:SECRET -- cmd arg1 arg2

Note that you still can't do this, as it would be parsed by the shell instead of the actual command.

$ polykey secrets env vault:SECRET -- cmd arg1 arg2 && cmd2
'cmd' run by polykey
'cmd2' run by shell

Issues Fixed

• Fixes #325 (FIX ENG-466)

Tasks

• [x] 1. Move parsing to action and emulate what it does
• [x] 2. Remove old parser
• [x] 3. Update tests

Final checklist

• [x] Domain specific tests
• [x] Full tests
• [x] Updated inline-comment documentation
• [x] Lint fixed
• [x] Squash and rebased
• [x] Sanity check the final build

[linear[bot]]

ENG-466 `secrets env` needs `--` to be passed twice to parse the command

[aryanjassal]

I ran a couple of manual sanity checks to check this behaviour.

$ polykey secrets env testvault:SECRET1 -- bash -c 'echo $SECRET1'
testing

$ polykey secrets env testvault --preserve-newline testvault -- bash -c echo "$SECRET1"
testing

$ polykey secrets env testvault -- node -e 'console.log(JSON.stringify(process.env["SECRET1"]))'
"testing"

$ polykey secrets env testvault -- -- echo 'hi'
ErrorPolykeyCLIChildProcessFailure: A child process failed to exit gracefully - Command failed with error Error: 2
  data: {"command":["--","echo","hi"]}
  cause: Error: 2

$ polykey secrets env -- echo 'hi'
You must provide at least 1 secret path
Usage: polykey secrets env [options] <args...>

Run a command with the given secrets and env variables. If no command is specified then the variables are printed to stdout in the format specified by env-format.

Arguments:
  args                                command and arguments formatted as <envPaths...> [-- cmd [cmdArgs...]]

Options:
  -np, --node-path <path>             Path to Node State (default: "/home/aryanj/.local/share/polykey", env: PK_NODE_PATH)
  -pf, --password-file <path>         Path to Password
  -f, --format <format>               Output Format (choices: "human", "json", default: "human")
  -v, --verbose                       Log Verbose Messages (default: 0)
  -ni, --node-id <id>                  (env: PK_NODE_ID)
  -ch, --client-host <host>           Client Host Address (env: PK_CLIENT_HOST)
  -cp, --client-port <port>           Client Port (env: PK_CLIENT_PORT)
  -ef --env-format <envFormat>        Select how the env variables are formatted on stdout if no command is specified (choices: "auto", "json", "unix", "cmd", "powershell", default: "auto")
  -ei --env-invalid <envInvalid>      How invalid env variable names are handled when retrieving secrets. `error` will throw, `warn` will log a warning and drop and `ignore` will silently drop. (choices: "error", "warn", "ignore", default: "error")
  -ed --env-duplicate <envDuplicate>  How duplicate env variable names are handled. `keep` will keep the exising secret, `overwrite` will overwrite existing with the new secret, `warn` will log a warning and overwrite and `error` will throw. (choices: "keep", "overwrite", "warn", "error", default: "overwrite")
  --preserve-newline <path>           Preserve the last trailing newline for the secret content (default: [])
  -h, --help                          display help for command

So, I think this is ready for merge now.

[aryanjassal]

Everything seems to be done for this PR. The CI is also passing. Merging.