Switch to NodeJS v12 (LTS) for build

taskcluster/.shared.yml

@@ -15,6 +15,7 @@ nodejs:
   packages_trusty:
     apt: 'nodejs sox'
     apt_pinning: '(echo "Package: nodejs" && echo "Pin: origin deb.nodesource.com" && echo "Pin-Priority: 999") > /etc/apt/preferences'
+    prep_12: 'echo "deb http://deb.nodesource.com/node_12.x trusty main" > /etc/apt/sources.list.d/nodesource.list && wget -qO- https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -'
   packages_xenial:
     apt: 'nodejs sox'
     apt_pinning: '(echo "Package: nodejs" && echo "Pin: origin deb.nodesource.com" && echo "Pin-Priority: 999") > /etc/apt/preferences'

taskcluster/linux-amd64-cpu-opt.yml

@@ -8,7 +8,7 @@ build:
     - "notify.irc-channel.${notifications.irc}.on-failed"
   system_setup:
     >
-      ${nodejs.packages_trusty.prep_8} && ${nodejs.packages_trusty.apt_pinning}
+      ${nodejs.packages_trusty.prep_12} && ${nodejs.packages_trusty.apt_pinning}
       && apt-get -qq update && apt-get -qq -y install nodejs python-yaml &&
       apt-get -qq -y install ${python.packages_trusty.apt} && ${swig.packages.install_script}
   system_config:

taskcluster/linux-amd64-ctc-opt.yml

@@ -8,7 +8,7 @@ build:
     - "notify.irc-channel.${notifications.irc}.on-failed"
   system_setup:
     >
-      ${nodejs.packages_trusty.prep_8} && ${nodejs.packages_trusty.apt_pinning}
+      ${nodejs.packages_trusty.prep_12} && ${nodejs.packages_trusty.apt_pinning}
       && apt-get -qq update && apt-get -qq -y install nodejs python-yaml &&
       apt-get -qq -y install ${python.packages_trusty.apt} && ${swig.packages.install_script}
   system_config:

taskcluster/linux-amd64-gpu-opt.yml

@@ -6,7 +6,7 @@ build:
     - "index.project.deepspeech.deepspeech.native_client.gpu.${event.head.sha}"
   system_setup:
     >
-      ${nodejs.packages_trusty.prep_8} && ${nodejs.packages_trusty.apt_pinning}
+      ${nodejs.packages_trusty.prep_12} && ${nodejs.packages_trusty.apt_pinning}
       && apt-get -qq update && apt-get -qq -y install nodejs python-yaml &&
       apt-get -qq -y install ${python.packages_trusty.apt} && ${swig.packages.install_script}
   system_config:

taskcluster/linux-amd64-tflite-opt.yml

@@ -8,7 +8,7 @@ build:
     - "notify.irc-channel.${notifications.irc}.on-failed"
   system_setup:
     >
-      ${nodejs.packages_trusty.prep_8} && ${nodejs.packages_trusty.apt_pinning}
+      ${nodejs.packages_trusty.prep_12} && ${nodejs.packages_trusty.apt_pinning}
       && apt-get -qq update && apt-get -qq -y install nodejs python-yaml &&
       apt-get -qq -y install ${python.packages_trusty.apt} && ${swig.packages.install_script}
   system_config:

taskcluster/linux-arm64-cpu-opt.yml

@@ -11,7 +11,7 @@ build:
       apt-get -qq -y install gdebi git pixz &&
       wget http://mirrors.kernel.org/ubuntu/pool/universe/m/multistrap/multistrap_2.2.0ubuntu2_all.deb -O /tmp/multistrap_2.2.0ubuntu2_all.deb &&
       echo "y" | gdebi /tmp/multistrap_2.2.0ubuntu2_all.deb &&
-      ${nodejs.packages_trusty.prep_8} && ${nodejs.packages_trusty.apt_pinning}
+      ${nodejs.packages_trusty.prep_12} && ${nodejs.packages_trusty.apt_pinning}
       && apt-get -qq update && apt-get -qq -y install nodejs python-yaml &&
       apt-get -qq -y install ${python.packages_trusty.apt} && ${swig.packages.install_script}
   system_config:

taskcluster/linux-rpi3-cpu-opt.yml

@@ -11,7 +11,7 @@ build:
       apt-get -qq -y install gdebi git pixz &&
       wget http://mirrors.kernel.org/ubuntu/pool/universe/m/multistrap/multistrap_2.2.0ubuntu2_all.deb -O /tmp/multistrap_2.2.0ubuntu2_all.deb &&
       echo "y" | gdebi /tmp/multistrap_2.2.0ubuntu2_all.deb &&
-      ${nodejs.packages_trusty.prep_8} && ${nodejs.packages_trusty.apt_pinning}
+      ${nodejs.packages_trusty.prep_12} && ${nodejs.packages_trusty.apt_pinning}
       && apt-get -qq update && apt-get -qq -y install nodejs python-yaml &&
       apt-get -qq -y install ${python.packages_trusty.apt} && ${swig.packages.install_script}
   system_config:

taskcluster/node-package-cpu.yml

@@ -11,7 +11,7 @@ build:
     - "notify.irc-channel.${notifications.irc}.on-failed"
   system_setup:
     >
-      ${nodejs.packages_trusty.prep_6} && ${nodejs.packages_trusty.apt_pinning}
+      ${nodejs.packages_trusty.prep_12} && ${nodejs.packages_trusty.apt_pinning}
       && apt-get -qq update && apt-get -qq -y install nodejs python-yaml &&
       apt-get -qq -y install ${python.packages_trusty.apt} && ${swig.packages.install_script}
   system_config:

taskcluster/node-package-gpu.yml

@@ -8,7 +8,7 @@ build:
     - "notify.irc-channel.${notifications.irc}.on-failed"
   system_setup:
     >
-      ${nodejs.packages_trusty.prep_6} && ${nodejs.packages_trusty.apt_pinning}
+      ${nodejs.packages_trusty.prep_12} && ${nodejs.packages_trusty.apt_pinning}
       && apt-get -qq update && apt-get -qq -y install nodejs python-yaml &&
       apt-get -qq -y install ${python.packages_trusty.apt} && ${swig.packages.install_script}
   system_config: