Create simulate.yml

Copy from https://github.com/lupyuen/pinetime-lab/blob/master/.github/workflows/main.yml

.github/workflows/simulate.yml

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+# GitHub Actions Workflow to build FreeRTOS Firmware for PineTime Smart Watch
+# See https://lupyuen.github.io/pinetime-rust-mynewt/articles/cloud
+# Based on https://github.com/JF002/Pinetime/blob/master/doc/buildAndProgram.md
+# and https://github.com/JF002/Pinetime/blob/master/bootloader/README.md
+
+# Name of this Workflow
+name: Simulate PineTime Firmware
+
+# When to run this Workflow...
+on:
+
+  # Run this Workflow when files are updated (Pushed) in the "master" Branch
+  push:
+    branches: [ master ]
+    
+  # Also run this Workflow when a Pull Request is created or updated in the "master" Branch
+  pull_request:
+    branches: [ master ]
+
+# Steps to run for the Workflow
+jobs:
+  build:
+
+    # Run these steps on Ubuntu
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Fetch cache for Rust Toolchain
+      id:   cache-rust
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Install Rust Toolchain for emscripten
+      run:  |
+        rustup default nightly
+        rustup target add wasm32-unknown-emscripten
+
+    - name: Check cache for emscripten
+      id:   cache-emsdk
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-emsdk
+      with:
+        path: /tmp/emsdk
+        key:  ${{ runner.os }}-build-${{ env.cache-name }}
+        restore-keys: ${{ runner.os }}-build-${{ env.cache-name }}
+
+    - name: Install emscripten
+      if:   steps.cache-emsdk.outputs.cache-hit != 'true'  # Install emscripten if not found in cache
+      run:  |
+        # Based on https://emscripten.org/docs/getting_started/downloads.html
+        cd /tmp
+
+        # Get the emsdk repo
+        git clone https://github.com/emscripten-core/emsdk.git
+
+        # Enter that directory
+        cd emsdk
+
+        # Download and install the latest SDK tools.
+        ./emsdk install latest
+
+        # Make the "latest" SDK "active" for the current user. (writes .emscripten file)
+        ./emsdk activate latest
+
+        # Activate PATH and other environment variables in the current terminal
+        source ./emsdk_env.sh
+
+        # Show version
+        emcc --version
+        emcc --version        
+
+    - name: Check cache for wabt
+      id:   cache-wabt
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-wabt
+      with:
+        path: /tmp/wabt
+        key:  ${{ runner.os }}-build-${{ env.cache-name }}
+        restore-keys: ${{ runner.os }}-build-${{ env.cache-name }}
+
+    - name: Install wabt
+      if:   steps.cache-wabt.outputs.cache-hit != 'true'  # Install wabt if not found in cache
+      run:  |
+        cd /tmp
+        git clone --recursive https://github.com/WebAssembly/wabt
+        cd wabt
+        mkdir build
+        cd build
+        cmake ..
+        cmake --build .
+
+    - name: Build LVGL
+      run:  |
+        # Add emscripten and wabt to the PATH
+        source /tmp/emsdk/emsdk_env.sh
+        export PATH=$PATH:/tmp/wabt/build
+
+        # Build LVGL app: wasm/lvgl.html, lvgl.js, lvgl.wasm
+        wasm/lvgl.sh
+
+    - name: Show files
+      run:  set ; pwd ; ls -l
+
+    - name: Upload Outputs
+      uses: actions/upload-artifact@v2
+      with:
+        name: wasm
+        path: |
+          wasm/*.html
+          wasm/*.js
+          wasm/*.wasm
+          wasm/*.txt