Update Dockerfile with environment variables and add Docker CI

Added Docker CI, updated README.md with more information on how to run
the Docker container, and added CI (just testing it out)

.github/workflows/docker-image.yml

@@ -0,0 +1,18 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build the Docker image
+      run: docker build -t awscibo . --file Dockerfile --tag awscibo:$(date +%s)

Dockerfile

@@ -1,3 +1,3 @@
 FROM node:latest
 RUN npm i -g awscibo
-CMD ["awscibo", "yourbottokenhere"]
+CMD awscibo $BOT_TOKEN

README.md

@@ -54,15 +54,11 @@ node awesomescibo.mjs
 ```
 git clone https://github.com/ADawesomeguy/AwesomeSciBo.git
 ```
-2) Enter repo and edit bot token in Dockerfile
-```
-cd AwesomeSciBo.
-vim Dockerfile
-```
-3) Build and run Docker image
+2) Enter repo, build, and run Docker image
 ```
+cd AwesomeSciBo
 docker build -t awscibo .
-docker run --name awscibo -d awscibo
+docker run -e BOT_TOKEN=[your bot token here] --name awscibo -d awscibo
 ```
 ## Usage
 To get started, run the command `do be helping` to get a list of commands. The more helpful commands will be the ones that generate packets, which are `do be roundgen pdf/html` and `do be roundgen pdf/html dm`.