Fix doxygen (#2286)

* install graphviz to fix missing dot command

* try excludes

* can't use newline

* try

* add ChibiOS-Contrib

.github/workflows/gen-docs.yaml

@@ -14,13 +14,13 @@ jobs:
         submodules: recursive
         fetch-depth: 0
 
-    - name: Install ncftp, kicad, doxygen, and yq
+    - name: Install ncftp, kicad, doxygen, graphviz, and yq
       run: |
         sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CC86BB64
         sudo add-apt-repository ppa:rmescandon/yq
         sudo add-apt-repository ppa:kicad/kicad-5.1-releases
         sudo apt-get update
-        sudo apt-get install ncftp kicad doxygen yq
+        sudo apt-get install ncftp kicad doxygen graphviz yq
 
     - name: Set FTP variables
       env:

firmware/Doxyfile

@@ -780,7 +780,7 @@ RECURSIVE              = YES
 # Note that relative paths are relative to the directory from which doxygen is
 # run.
 
-EXCLUDE                =
+EXCLUDE                = ./ChibiOS ./ChibiOS-Contrib ./config/boards/hellen/cypress/OS
 
 # The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
 # directories that are symbolic links (a Unix file system feature) are excluded