Remove postgres backend setups: (#171)

## Description


Postgres backend has been deprecated for some time. Users should use the Kubernetes backend and ideally use the helm chart.

https://github.com/tinkerbell/charts

## Why is this needed



Fixes: #170 

## How Has This Been Tested?





## How are existing users impacted? What migration steps/scripts do we need?





## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

.gitignore

@@ -1,10 +1,7 @@
 # hidden files/dirs
 .*
-!deploy/stack/compose/postgres/state/webroot/misc/osie/current/.keep
-!deploy/stack/compose/postgres/state/webroot/workflow/.keep
 !deploy/infrastructure/vagrant/.env
 !deploy/stack/compose/.env
-!deploy/stack/compose/postgres/.env
 !.gitignore
 !.github/
 
@@ -18,9 +15,6 @@
 
 compose.tar.gz
 compose.zip
-deploy/stack/compose/postgres/state/webroot/*.gz
-deploy/stack/compose/postgres/state/webroot/misc/osie/current/*
-deploy/stack/compose/postgres/state/webroot/workflow/*
 deploy/stack/compose/manifests/manifests.yaml
 deploy/stack/compose/state/*
 !deploy/stack/compose/state/.keep

deploy/infrastructure/vagrant/.env

@@ -4,9 +4,6 @@ LOADBALANCER_IP=192.168.56.5
 MACHINE1_IP=192.168.56.43
 MACHINE1_MAC=08:00:27:9e:f5:3a
 
-#USE_POSTGRES=true
-USE_POSTGRES=
-
 # USE_HELM=true
 USE_HELM=true
 

deploy/infrastructure/vagrant/Vagrantfile

@@ -14,7 +14,6 @@ PROVISIONER_IP = ENV["PROVISIONER_IP"] || "192.168.56.4"
 LOADBALANCER_IP = ENV["LOADBALANCER_IP"] || "192.168.56.4"
 MACHINE1_IP = ENV["MACHINE1_IP"] || "192.168.56.43"
 MACHINE1_MAC = (ENV["MACHINE1_MAC"] || "08:00:27:9E:F5:3A").downcase
-USE_POSTGRES = ENV["USE_POSTGRES"] || ""
 USE_HELM = ENV["USE_HELM"] || ""
 HELM_CHART_VERSION = ENV["HELM_CHART_VERSION"] || "0.1.2"
 HELM_LOADBALANCER_INTERFACE = ENV["HELM_LOADBALANCER_INTERFACE"] || "eth1"
@@ -30,10 +29,6 @@ Vagrant.configure("2") do |config|
   end
 
   config.vm.define "provisioner" do |provisioner|
-    if USE_POSTGRES == "true" && USE_HELM == "true"
-      puts "USE_POSTGRES and USE_HELM cannot both be true"
-      abort
-    end
     if USE_HELM == "true"
       STACK_DIR = STACK_BASE_DIR + "helm/"
       DEST_DIR = DEST_DIR_BASE + "helm/"
@@ -58,9 +53,6 @@ Vagrant.configure("2") do |config|
       override.vm.synced_folder STACK_BASE_DIR, DEST_DIR_BASE, type: "rsync"
     end
 
-    if USE_POSTGRES == "true"
-      DEST_DIR = DEST_DIR_BASE + STACK_OPT + "postgres"
-    end
     provisioner.vm.provision :shell, path: STACK_DIR + "/setup.sh", args: [PROVISIONER_IP, MACHINE1_IP, MACHINE1_MAC, DEST_DIR, LOADBALANCER_IP, HELM_CHART_VERSION, HELM_LOADBALANCER_INTERFACE]
   end