[v2] Distribute binaries for alpine / musl libc

```
docker run -it --rm docker:latest sh
wget "https://d1vvhvl2y92vvt.cloudfront.net/awscli-exe-linux-x86_64.zip" -O "awscliv2.zip"
# curl not installed
unzip awscliv2.zip
./aws/install
# sudo not install
```

Errors with:
```
/ # ./aws/install
./aws/install: line 78: /aws/dist/aws2: not found
You can now run: /usr/local/bin/aws2 --version
/ # aws2
sh: aws2: not found
```
