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>

backend/install-sdk.sh

@@ -11,8 +11,8 @@ fi
 frontend="../frontend/dist/static"
 [ -d "$frontend" ] || mkdir -p "$frontend"
 
-if [ -z "$OS_ARCH" ]; then
-  export OS_ARCH=$(uname -m)
+if [ -z "$PLATFORM" ]; then
+  export PLATFORM=$(uname -m)
 fi
 
 cargo install --path=. --no-default-features --features=js_engine,sdk,cli --locked