Bump dockerfile to node 12

Author: sgreene570

.github/workflows/node-js.yml

@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x, 10.x]
+        node-version: [8.x, 10.x, 12.x]
 
     steps:
       - uses: actions/checkout@v2

Dockerfile

@@ -14,7 +14,7 @@ RUN apt-get -yq update && \
 
 ADD . /opt/conditional
 
-RUN curl -sL https://deb.nodesource.com/setup_10.x | bash - && \
+RUN curl -sL https://deb.nodesource.com/setup_12.x | bash - && \
     apt-get -yq update && \
     apt-get -yq install nodejs && \
     npm install && \