Added more docker jobs and apply same naming convention as build jobs

docker/build-docs/Dockerfile

@@ -0,0 +1,13 @@
+FROM nickblah/lua:5.1.5-luarocks-ubuntu
+
+RUN apt-get -qq update
+RUN apt-get -qq install tree
+RUN apt-get -qq install build-essential
+RUN apt-get -qq install git
+RUN luarocks install markdown 0.32-2
+RUN luarocks install penlight 1.11.0-1
+RUN luarocks install metalua-compiler 0.7.3-1
+RUN luarocks install metalua-parser 0.7.3-2
+RUN luarocks install checks
+COPY start.sh /start.sh
+RUN chmod +x /start.sh

docker/build-docs/docker-compose.yml

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+version: "3.5"
+
+services:
+  lua:
+    image: moose/build-docs
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: moose-build-docs
+    volumes:
+      - ../../:/moose
+    stdin_open: true
+    tty: true
+    command: /bin/bash -c /start.sh

docker/build-docs/start.sh

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+#!/bin/sh
+
+# Prepare environment
+cd /moose/
+mkdir -p build/tools
+mkdir -p build/doc
+
+# Checkout luadocumentor
+cd /moose/build/tools
+if [ ! -f /moose/build/tools/luadocumentor/luadocumentor.lua ]
+then
+    git clone --branch patch-1 --single-branch https://github.com/Applevangelist/luadocumentor.git
+fi
+
+# Run luadocumentor
+cd /moose/build/tools/luadocumentor
+lua luadocumentor.lua -d /moose/build/doc '/moose/Moose Development/Moose'
+
+# Copy generated files in the MOOSE_DOCS repo if it is already there
+if [ -d /moose/build/MOOSE_DOCS/Documentation ]; then
+  rm -rf /moose/build/MOOSE_DOCS/Documentation
+  mkdir -p /moose/build/MOOSE_DOCS/Documentation
+  cp /moose/build/doc/* /moose/build/MOOSE_DOCS/Documentation/
+fi