Make things run in parallel

.woodpecker/.test.yml

@@ -1,5 +1,6 @@
 pipeline:
   test-debian:
+    group: test
     image: openlp/debian
     pull: true
     commands:
@@ -11,6 +12,7 @@ pipeline:
     #     - linux.coverage
 
   test-ubuntu:
+    group: test
     image: openlp/ubuntu
     pull: true
     commands:
@@ -18,6 +20,7 @@ pipeline:
       - xvfb-run -s '-screen 0 1024x768x24' pytest-3 --color=no --disable-warnings
 
   test-fedora:
+    group: test
     image: openlp/fedora
     pull: true
     commands:
@@ -25,6 +28,7 @@ pipeline:
       - xvfb-run -s '-screen 0 1024x768x24' pytest-3 --color=no --disable-warnings
 
   test-arch:
+    group: test
     image: openlp/arch
     pull: true
     commands: