WIP Trying to run builds in parallel

Not only this should speed up build, but also should workaround
the 4M logs limits, since it will create one log per build rather
than concatenating them all.

Author: AndreMiras

.travis.yml

@@ -8,11 +8,13 @@ services:
 before_install:
   - docker build --tag=p4a .
 
-script:
-  - docker run p4a /bin/sh -c 'uname -a'
-  - docker run p4a /bin/sh -c '. venv/bin/activate && p4a apk --help'
-  - docker run p4a /bin/sh -c '. venv/bin/activate && cd testapps/ && python setup_testapp_python2.py apk --sdk-dir /opt/android/android-sdk --ndk-dir /opt/android/android-ndk'
+env:
+  - COMMAND='uname -a'
+  - COMMAND='. venv/bin/activate && p4a apk --help'
+  - COMMAND='. venv/bin/activate && cd testapps/ && python setup_testapp_python2.py apk --sdk-dir /opt/android/android-sdk --ndk-dir /opt/android/android-ndk'
   # overrides requirements to skip `peewee` pure python module, see:
   # https://github.com/kivy/python-for-android/issues/1263#issuecomment-390421054
-  # python setup_testapp_python2_sqlite_openssl.py apk --sdk-dir /opt/android/android-sdk --ndk-dir /opt/android/android-ndk --requirements sdl2,pyjnius,kivy,python2,openssl,requests,sqlite3
-  - docker run p4a /bin/sh -c '. venv/bin/activate && cd testapps/ && python setup_testapp_python2_sqlite_openssl.py apk --sdk-dir /opt/android/android-sdk --ndk-dir /opt/android/android-ndk --requirements sdl2,pyjnius,kivy,python2,openssl,requests,sqlite3'
+  - COMMAND='. venv/bin/activate && cd testapps/ && python setup_testapp_python2_sqlite_openssl.py apk --sdk-dir /opt/android/android-sdk --ndk-dir /opt/android/android-ndk --requirements sdl2,pyjnius,kivy,python2,openssl,requests,sqlite3'
+
+script:
+  - docker run p4a /bin/sh -c "$COMMAND"