create github actions workflow

build and deploy site for each new commit, plzkthx

.github/workflows/build-and-deploy.yml

@@ -0,0 +1,24 @@
+on:
+  push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Update apt repos
+        run: sudo apt-get update
+
+      - name: Install node
+        run: curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash - && sudo apt-get install -y nodejs
+
+      - name: Install yarn
+        run: curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add - && echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list && sudo apt-get update && sudo apt-get install yarn 
+
+      - name: node version mgr
+        run: nvm use v10.15.3
+
+      - name: Install dependencies
+        run: yarn install
+