Adds missing required `procps` package
Adds missing required `procps` package

In very limited environments, Homebrew manual install fails with :

```
/root/.linuxbrew/Homebrew/Library/Homebrew/cmd/shellenv.sh: line 9: /bin/ps: No such file or directory
```

This has to be fixed by explicitly provisioning `ps` command on the system, since Brew 2.4.7 (see `c1666676`).
JCount/brew,MikeMcQuaid/brew,nandub/brew,Homebrew/brew,sjackman/homebrew,sjackman/homebrew,Homebrew/brew,JCount/brew,JCount/brew,EricFromCanada/brew,EricFromCanada/brew,EricFromCanada/brew,EricFromCanada/brew,MikeMcQuaid/brew,sjackman/homebrew,claui/brew,JCount/brew,Homebrew/brew,nandub/brew,claui/brew,MikeMcQuaid/brew,claui/brew,nandub/brew,nandub/brew,Homebrew/brew,claui/brew,sjackman/homebrew,MikeMcQuaid/brew