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>

image-recipe/README.md

@@ -0,0 +1,23 @@
+# StartOS Image Recipes
+
+Code and `debos` recipes that are used to create the StartOS live and installer
+images.
+
+If you want to build a local image in the exact same environment used to build
+official StartOS images, you can use the `run-local-build.sh` helper script:
+
+```bash
+# Prerequisites
+sudo apt-get install -y debspawn
+sudo mkdir -p /etc/debspawn/ && echo "AllowUnsafePermissions=true" | sudo tee /etc/debspawn/global.toml
+
+# Get dpkg
+mkdir -p overlays/startos/root
+wget -O overlays/startos/root/startos_0.3.x-1_amd64.deb <dpkg_url>
+
+# Build image
+./run-local-build.sh
+```
+
+In order for the build to work properly, you will need debspawn >= 0.5.1, the
+build may fail with prior versions.