consolidate and streamline build (#2469)

* consolidate and streamline build

* fix workflow syntax

* fix workflow syntax

* fix workflow syntax

* fix workflow syntax

* fix build scripts

* only build platform-specific system images

* fix build script

* more build fixes

* fix

* fix compat build for x86

* wat

* checkout

* Prevent rebuild of compiled artifacts

* Update startos-iso.yaml

* Update startos-iso.yaml

* fix raspi build

* handle missing platform better

* reduce arm vcpus

* remove arch and platform from fe config, add to patch db

---------

Co-authored-by: Matt Hill <mattnine@protonmail.com>

frontend/config-sample.json

@@ -1,8 +1,6 @@
 {
   "useMocks": true,
   "enableWidgets": false,
-  "packageArch": "aarch64",
-  "osArch": "raspberrypi",
   "ui": {
     "api": {
       "url": "rpc",