Set up dev environment

Justfile

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+default:
+    @just --list --unsorted
+
+# build firmware
+build:
+    echo "Building firmware..."
+
+# clear build cache
+clean:
+    rm -rf build
+
+# list all build targets
+list:
+    echo "TBD"
+
+# initialize west
+init:
+    west init -l config
+    west update
+    west zephyr-export
+
+# upgrade west
+upgrade:
+    west update
+
+# upgrade zephyr
+upgrade-zephyr:
+    nix flake update --flake .