add repeatable arg validations regression test

Author: DannyBen

spec/approvals/fixtures/repeatable-arg-validations

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++ bundle exec bashly generate
+creating user files in src
+created src/initialize.sh
+created src/root_command.sh
+created ./cli
+run ./cli --help to test your bash script
++ ./cli
+# this file is located in 'src/root_command.sh'
+# you can edit it freely and regenerate (it will not be overwritten)
+args: none
++ ./cli 1
+# this file is located in 'src/root_command.sh'
+# you can edit it freely and regenerate (it will not be overwritten)
+args:
+- ${args[number]} = "1"
++ ./cli 1 2
+# this file is located in 'src/root_command.sh'
+# you can edit it freely and regenerate (it will not be overwritten)
+args:
+- ${args[number]} = "1" "2"
++ ./cli 1.1
+validation error in NUMBER:
+must be an integer
++ ./cli 1.1 2
+validation error in NUMBER:
+must be an integer
++ ./cli 1 2.2
+validation error in NUMBER:
+must be an integer

spec/fixtures/workspaces/repeatable-arg-validations/.gitignore

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+cli
+src/*.sh

spec/fixtures/workspaces/repeatable-arg-validations/README.md

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+This fixture tests that validations on repeatable args validate all arguments
+**regardless of order**.
+Reference issue: https://github.com/DannyBen/bashly/issues/311

spec/fixtures/workspaces/repeatable-arg-validations/src/bashly.yml

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+name: cli
+help: all arguments must be integers
+
+args:
+- name: number
+  repeatable: true
+  validate: integer

spec/fixtures/workspaces/repeatable-arg-validations/src/lib/validate_integer.sh

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+validate_integer() {
+  [[ "$1" =~ ^[0-9]+$ ]] || echo "must be an integer"
+}

spec/fixtures/workspaces/repeatable-arg-validations/test.sh

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+#!/usr/bin/env bash
+
+rm -f ./cli
+rm -f ./src/initialize.sh
+rm -f ./src/root_command.sh
+
+set -x
+
+bundle exec bashly generate
+
+./cli
+./cli 1
+./cli 1 2
+./cli 1.1
+./cli 1.1 2
+./cli 1 2.2