ci: add deploy workflow + build script

.github/workflows/deploy.yaml

@@ -0,0 +1,28 @@
+name: Github Pages
+
+on: [push]
+
+permissions:
+  contents: write
+
+jobs:
+  build-github-pages:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2 # repo checkout
+      - uses: mymindstorm/setup-emsdk@v11 # setup emscripten toolchain
+        # with:
+        #   version: 3.1.35
+      - uses: actions-rs/toolchain@v1 # get rust toolchain for wasm
+        with:
+          toolchain: stable
+          target: wasm32-unknown-emscripten
+          override: true
+      - name: Rust Cache # cache the rust build artefacts
+        uses: Swatinem/rust-cache@v1
+      - name: Build # build
+        run: ./build.sh
+      - name: Deploy
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          folder: dist

build.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -eux
+
+cargo build --target=wasm32-unknown-emscripten --release
+
+mkdir -p dist
+
+cp target/wasm32-unknown-emscripten/release/rust_sdl2_wasm.wasm dist
+cp target/wasm32-unknown-emscripten/release/rust-sdl2-wasm.js dist
+cp index.html dist