Static Deploy to Github Pages (#73)

Addresses #58 , "As a member of the public, I want to see J40's website live on the internet, so that I know it's real!" - hosting on github pages for now as a temporary measure. This fix does NOT: 1) add .gov domain hosting, or 2) post to the geoplatform s3 bucket. This will need to happen in a subsequent fix. 

The changes made specifically to enable this for now:
* Adding github action to build, test, and deploy on pushes to client/
* Adding path prefix to build gh-pages at https://usds.github.io/justice40-tool/
* (Temporarily) pointing to fix branch for trussworks to enable SSR building
* Removing the workaround for the above bug in gatsby-node.js
* Setting build target to be 14.x due to version number limitations
* Adding gh-pages dependency, deploy action for manual deploy
* Force renaming J40header -> J40Header and J40footer -> J40Footer due to Linux case sensitivity

.github/workflows/node.js.yml

@@ -0,0 +1,61 @@
+# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: GH Pages deploy
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'client/**/*'
+  pull_request:
+    branches: [main]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: client
+    strategy:
+      matrix:
+        node-version: [14.x]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install
+        run: npm ci
+      - name: Build
+        run: npm run build --if-present
+      - name: Get directory contents
+        run: ls -la public
+      - name: Test
+        run: npm test
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: J40Static
+          # Upload-artifact does not support the default working directory
+          # See more: https://github.com/actions/upload-artifact/issues/87
+          path: ./client/public
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v2
+      - name: Download Artifacts
+        uses: actions/download-artifact@v2
+        with:
+          name: J40Static
+          path: ./public
+      - name: Deploy 🚀
+        uses: JamesIves/github-pages-deploy-action@4.1.0
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          BRANCH: gh-pages # The branch the action should deploy to.
+          FOLDER: public # The folder the action should deploy.