Ppfw docker build (#1725)

* Docker build ppfw by default

* Allow GH workflows to be triggered from any branch

* Fix asset path for github upload

dockerfile-nogit-alpine

@@ -24,4 +24,4 @@ RUN mkdir ~/bin && cd ~/bin && \
     for tool in gcc g++ cpp c++;do ln -s $(which ccache) arm-none-eabi-$tool;done
 
 CMD cd .. && cd build && \
-    cmake .. && make firmware
+    cmake .. && make ppfw