First version of builder

Dockerfile

@@ -0,0 +1,9 @@
+FROM debian:latest
+RUN apt-get update && apt-get install -y \
+  cmake \
+  gcc-arm-none-eabi \
+  nodejs \
+  npm \
+  && rm -rf /var/lib/apt/lists/*
+
+# node and nodejs are needed for the checkout job in the gitea runner