Simplify .travis.yml (#719)

.travis.yml

@@ -1,15 +1,23 @@
+language: cpp
+
+services:
+    - docker
+
 git:
     submodules: false
 
-_linux_shared: &linux_shared
-    os: linux
-    sudo: false
-    services:
-        - docker
-    before_install:
+env:
+    - distro: debian
+    - distro: archlinux
+    - distro: fedora
+    - distro: alpine
+    - distro: opensuse
+
+before_install:
     - docker pull alexays/waybar:${distro}
     - find . -type f \( -name '*.cpp' -o -name '*.h' \) -print0 | xargs -r0 clang-format -i
-    script:
+
+script:
     - echo FROM alexays/waybar:${distro} > Dockerfile
     - echo ADD . /root >> Dockerfile
     - docker build -t waybar .
@@ -17,21 +25,10 @@ _linux_shared: &linux_shared
 
 jobs:
   include:
-    - <<: *linux_shared
-      env: distro=debian
-    - <<: *linux_shared
-      env: distro=archlinux
-    - <<: *linux_shared
-      env: distro=fedora
-    - <<: *linux_shared
-      env: distro=alpine
-    - <<: *linux_shared
-      env: distro=opensuse
     - os: freebsd
-      language: cpp
       compiler: clang
-      sudo: required
-      install:
+      env:
+      before_install:
         - sudo sed -i '' 's/quarterly/latest/' /etc/pkg/FreeBSD.conf
         - sudo pkg install -y date gtk-layer-shell gtkmm30 jsoncpp libdbusmenu
                libfmt libmpdclient libudev-devd meson pulseaudio scdoc spdlog