feat: avm helper script

[matt-FFFFFF]

This pull request adds a new script called avm which is a helper script for Azure Terraform module development. The script allows users to run make targets inside a Docker container. This script is useful for automating common development tasks and improving the development workflow.

[lonegunmanb]

In case someone is using podman or other runtime instead of docker, I think we can add a variable so the user could set it to their runtime like this:

#!/usr/bin/env sh

usage () {
  echo "Usage: avm <make target>"
}

CONTAINER_RUNTIME=${CONTAINER_RUNTIME:-docker}

if [ ! "$(command -v $CONTAINER_RUNTIME)" ]; then
    echo "Error: $CONTAINER_RUNTIME is not installed. Please install $CONTAINER_RUNTIME first."
    exit 1
fi

if [ -z "$1" ]; then
    echo "Error: Please provide a make target. See https://github.com/Azure/tfmod-scaffold/blob/main/avmmakefile for available targets."
    echo
    usage
    exit 1
fi

$CONTAINER_RUNTIME run --rm -v "$(pwd)":/src -w /src mcr.microsoft.com/azterraform make "$1"

I would also like to add a .bat version so Windows user could use the same helper:

@echo off
SETLOCAL

REM Set CONTAINER_RUNTIME to its current value if it's already set, or docker if it's not
IF DEFINED CONTAINER_RUNTIME (SET "CONTAINER_RUNTIME=%CONTAINER_RUNTIME%") ELSE (SET "CONTAINER_RUNTIME=docker")

REM Check if CONTAINER_RUNTIME is installed
WHERE /Q %CONTAINER_RUNTIME%
IF ERRORLEVEL 1 (
    echo Error: %CONTAINER_RUNTIME% is not installed. Please install %CONTAINER_RUNTIME% first.
    exit /b
)

REM Check if a make target is provided
IF "%~1"=="" (
    echo Error: Please provide a make target. See https://github.com/Azure/tfmod-scaffold/blob/main/avmmakefile for available targets.
    exit /b
)

REM Run the make target with CONTAINER_RUNTIME
%CONTAINER_RUNTIME% run --rm -v "%cd%":/src -w /src mcr.microsoft.com/azterraform make %1

ENDLOCAL

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implemented requested changes