Reduce job execution time

Author: ggeop

.travis.yml

@@ -1,4 +1,5 @@
 language: python
+cache: pip
 jobs:
   include:
     - name: "Python 3.8 on Focal"
@@ -7,24 +8,10 @@ jobs:
       python: 3.8
 
 before_install:
-- sudo apt-get update
-- sudo apt-get install build-essential
-- sudo apt-get install python3-dev
-- sudo apt-get install python3-setuptools
-- sudo apt-get install python3-pip
-- sudo apt-get install python3-venv
-- sudo apt-get install portaudio19-dev python3-pyaudio python3-pyaudio
-- sudo apt-get install libasound2-plugins libsox-fmt-all libsox-dev libxml2-dev libxslt-dev sox ffmpeg
-- sudo apt-get install espeak
-- sudo apt-get install libcairo2-dev libgirepository1.0-dev gir1.2-gtk-3.0
-- sudo apt install mongodb
-- sudo apt-get install gnupg
-
+  - bin/deploy/install_system_dependencies.sh
 
 install:
-  - echo "Install"
-  - pip install -r requirements.txt
-  - pip install -U scikit-learn
+  - bin/deploy/install_python_dependencies.sh
 
 script:
   - sudo bash run_tests.sh

bin/deploy/install_python_dependencies.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+#-----------------------------------
+# Install Python dependencies
+#-----------------------------------
+pip install -r requirements.txt
+pip install -U scikit-learn

bin/deploy/install_system_dependencies.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+#-----------------------------------
+# System dependencies installation
+#-----------------------------------
+sudo apt-get update && /
+sudo apt-get install build-essential && /
+sudo apt-get install python3-dev && /
+sudo apt-get install python3-setuptools && /
+sudo apt-get install python3-pip && /
+sudo apt-get install python3-venv && /
+sudo apt-get install portaudio19-dev python3-pyaudio python3-pyaudio && /
+sudo apt-get install libasound2-plugins libsox-fmt-all libsox-dev libxml2-dev libxslt-dev sox ffmpeg && /
+sudo apt-get install espeak && /
+sudo apt-get install libcairo2-dev libgirepository1.0-dev gir1.2-gtk-3.0  && /
+sudo apt install mongodb && /
+sudo apt-get install gnupg