Travis: Add testing with ubuntu 20.04 (aka focal)

.travis.yml

@@ -14,6 +14,7 @@ env:
   matrix:
     - OS_TYPE=llvm-latest RUN_TESTS=OFF WARNINGS_AS_ERRORS=ON TANGO_USE_USING_NAMESPACE=OFF USE_PCH=OFF
     - OS_TYPE=gcc-latest RUN_TESTS=OFF WARNINGS_AS_ERRORS=ON TANGO_USE_USING_NAMESPACE=OFF USE_PCH=OFF
+    - OS_TYPE=ubuntu-20.04
     - OS_TYPE=debian10
     - OS_TYPE=debian10 USE_PCH=OFF RUN_TESTS=OFF
     - OS_TYPE=debian10 CMAKE_BUILD_TYPE=Release

.travis/ubuntu-20.04/Dockerfile

@@ -0,0 +1,31 @@
+FROM ubuntu:focal
+
+ARG APP_UID=2000
+
+ARG APP_GID=2000
+
+MAINTAINER TANGO Controls team <tango@esrf.fr>
+
+RUN apt-get update && apt-get install -y \
+  apt-utils                              \
+  build-essential                        \
+  cmake                                  \
+  curl                                   \
+  git                                    \
+  libcos4-dev                            \
+  libomniorb4-dev                        \
+  libomnithread4-dev                     \
+  libzmq3-dev                            \
+  lsb-release                            \
+  omniidl                                \
+  python2
+
+RUN groupadd -g "$APP_GID" tango
+
+RUN useradd -u "$APP_UID" -g "$APP_GID" -ms /bin/bash tango
+
+ENV PKG_CONFIG_PATH=/home/tango/lib/pkgconfig
+
+USER tango
+
+WORKDIR /home/tango