[docker][travis] install cmake

needed for building opencv_bebop

.travis.yml

@@ -9,7 +9,7 @@ before_install:
   - sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa -y
   - sudo apt-get update -q
 install:
-  - sudo apt-get install -y paparazzi-dev paparazzi-jsbsim gcc-arm-embedded libipc-run-perl
+  - sudo apt-get install -y paparazzi-dev paparazzi-jsbsim gcc-arm-embedded libipc-run-perl cmake
 script:
   - arm-none-eabi-gcc --version
   - make test

docker/dep/Dockerfile

@@ -24,6 +24,7 @@ RUN add-apt-repository ppa:team-gcc-arm-embedded/ppa
 # install paparazzi-dev which pull in the dependencies
 # also install cross compiler and some stuff for X
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y \
+    cmake \
     gcc-arm-embedded \
     libcanberra-gtk-module \
     paparazzi-dev \