Improve build process by moving to script

Author: thpierce

CONTRIBUTING.md

@@ -6,21 +6,10 @@ documentation, we greatly value feedback and contributions from our community.
 Please read through this document before submitting any issues or pull requests to ensure we have all the necessary
 information to effectively respond to your bug report or contribution.
 
-## Build a Wheel file locally
-**First time setup**
+## Build and install distro locally
+From `aws-otel-python-instrumentation` dir, execute:
 ```sh
-pip install --upgrade pip setuptools wheel packaging build
-mkdir -p ./dist
-```
-**Updating the wheel file**
-```sh
-rm -rf ./dist/*
-cd ./aws-opentelemetry-distro
-python3 -m build --outdir ../dist
-cd ../dist
-pkg_version=$(grep '__version__' ../aws-opentelemetry-distro/src/amazon/opentelemetry/distro/version.py | awk -F '"' '{print $2}')
-pip install aws_opentelemetry_distro-${pkg_version}-py3-none-any.whl --force-reinstall
-cd ..
+./scripts/build_and_install_distro.sh
 ```
 
 ## Test a sample App

contract-tests/README.md

@@ -32,11 +32,11 @@ The steps to add a new test for a library or framework are:
 
 Pre-requirements:
 * Have `docker` installed and running - verify by running the `docker` command.
-* Ensure the `aws_opentelemetry_distro` wheel file exists in to `aws-otel-python-instrumentation/dist` folder
 
-From `aws-otel-python-instrumentation` dir, execute:
-
-```
-./contract-tests/set-up-contract-tests.sh
+Steps:
+* From `aws-otel-python-instrumentation` dir, execute:
+```sh
+./scripts/build_and_install_distro.sh
+./scripts/set-up-contract-tests.sh
 pytest contract-tests/tests
 ```

scripts/build_and_install_distro.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# Check script is running in contract-tests
+current_path=`pwd`
+current_dir="${current_path##*/}"
+if [ "$current_dir" != "aws-otel-python-instrumentation" ]; then
+  echo "Please run from aws-otel-python-instrumentation dir"
+  exit
+fi
+
+# Setup - update dependencies and create/empty dist dir
+pip install --upgrade pip setuptools wheel packaging build
+mkdir dist
+rm -rf dist/aws_opentelemetry_distro*
+
+# Build distro
+cd aws-opentelemetry-distro
+python3 -m build --outdir ../dist
+
+# Install distro
+cd ../dist
+DISTRO=(aws_opentelemetry_distro-*-py3-none-any.whl)
+pip install $DISTRO --force-reinstall
+cd ..