[Build] Add Github workflows

.github/actions/setup-superset/.eslintrc.json

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+{
+  "env": {
+    "commonjs": true,
+    "es6": true,
+    "node": true
+  },
+  "extends": "eslint:recommended",
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": 2018
+  },
+  "rules": {}
+}

.github/actions/setup-superset/README.md

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+# Setup Superset in GitHub Actions
+
+A [Github Action](https://help.github.com/en/actions) with a couple of short hands
+for setting up Superset in GitHub CI workflows.
+
+Mostly for reducing redundant code between workflows.
+
+After making edits to `/src`, make sure to run `npm run package` and
+commit `dist/index.js` to Git.

.github/actions/setup-superset/action.yml

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+name: Setup Superset
+description: Setup the CI/test envrionment for Apache Superset
+author: Jesse Yang <hello@yjc.me>
+inputs:
+  prepare:
+    required: false
+    description: prepare commands that always run one by one
+  run:
+    required: false
+    description: additional commands that may run in parallel
+    default: backend
+  parallel:
+    required: false
+    description: whether to run additional commands in parallel
+runs:
+  using: 'node12'
+  main: 'dist/index.js'