Support pacman based distros such as Arch/Manjaro in the install script

[jjnp]

Expected Behaviour

When installing faasd using the install srcript at hack/install.sh on a Linux distribution that uses pacman as the default package manager the installation should succeed.

Current Behaviour

Currently the script terminated with an error message saying that it cannot install on this OS, because neither apt-get or yum could be found.

List all Possible Solutions

1. Add a check to the script if pacman is present, and if yes simply use that instead of yum or apt-get.
2. Instead of installing the dependencies via a package manager, install manually (not recommended).

List the one solution that you would recommend

1. Add a check to the script if pacman is present, and if yes simply use that instead of yum or apt-get.

Steps to Reproduce (for bugs)

1. Try to run ./hack/install.sh on a distro using pacman as package manager (e.g. Arch/Manjaro) i.e. a distro that has neither apt-get nor yum installed

Context

I was trying to set up OpenFaaS with faasd as a backend using the hack/install.sh script in order to learn about OpenFaaS.

Your Environment

• OS and architecture: Manjaro Linux, x86_64

• Versions: Manjaro Linux 21.0 (rolling release), Kernel 5.11.6-1-MANJARO

go version
go version go1.16.2 linux/amd64

containerd -version
containerd github.com/containerd/containerd v1.3.7 8fba4e9a7d01810a393d5d25a3621dc101981175
uname -a
Linux jp-manjaro 5.11.6-1-MANJARO #1 SMP PREEMPT Thu Mar 11 19:05:51 UTC 2021 x86_64 GNU/Linux

cat /etc/os-release
NAME="Manjaro Linux"
ID=manjaro
ID_LIKE=arch
BUILD_ID=rolling
PRETTY_NAME="Manjaro Linux"
ANSI_COLOR="32;1;24;144;200"
HOME_URL="https://manjaro.org/"
DOCUMENTATION_URL="https://wiki.manjaro.org/"
SUPPORT_URL="https://manjaro.org/"
BUG_REPORT_URL="https://bugs.manjaro.org/"
LOGO=manjarolinux

faasd version
  __                     _ 
 / _| __ _  __ _ ___  __| |
| |_ / _` |/ _` / __|/ _` |
|  _| (_| | (_| \__ \ (_| |
|_|  \__,_|\__,_|___/\__,_|

faasd version: 0.11.4	commit: dca036ee51a7275389bf45c7839d22d437663a8e

[jjnp]

Full disclosure: I already applied the recommended changes. A PR is coming as soon as I get around to formatting it according to the guidelines.

[ksclarke]

Looks like this was merged, should this issue be closed?

[rgee0]

Derek close: addressed in #172