install platformio when testing

.gitlab-ci.yml

@@ -46,6 +46,8 @@ static_analysis:
     - apt install -qy build-essential
     - apt install -qy cppcheck
     - apt install -qy clang-format clang-tidy
+    - apt install -qy python-pip
+    - pip install -U platformio
     - pio init --ide atom
   script:
 #    - cppcheck --enable=all --check-config src