add github action

.github/workflows/scala.yml

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+name: Scala CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 90
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: 'recursive'
+
+    - name: Set up JDK 11
+      uses: actions/setup-java@v2
+      with:
+        java-version: '11'
+        distribution: 'adopt'
+
+    - name: Cache pip
+      uses: actions/cache@v2
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-v2
+        restore-keys: |
+          ${{ runner.os }}-pip-
+
+    - name: Cache SBT
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.ivy2/cache
+          ~/.sbt
+        key: ${{ runner.os }}-sbt-${{ hashFiles('**/build.sbt') }}
+
+    - name: Cache tools
+      id: tools
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/tools
+        key: ${{ runner.os }}-tools_v2
+
+    - name: Setup env
+      run: echo "$HOME/tools/bin" >> $GITHUB_PATH
+
+    - name: Install cached tools
+      if: steps.tools.outputs.cache-hit != 'true'
+      run: source tools.sh && (cd ~/ && install_verilator)
+
+    - name: Install uncached tools
+      run: (cd .. && git clone https://github.com/SpinalHDL/SpinalHDL.git -b dev)
+
+    - name: Compile tests
+      run: sbt "+test:compile"
+
+    - name: Run tests
+      run: sbt "+test"

tools.sh

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+#!/bin/sh
+
+install_verilator(){
+  sudo apt install -y git make autoconf g++ flex libfl-dev bison  # First time prerequisites
+  git clone http://git.veripool.org/git/verilator   # Only first time
+  unset VERILATOR_ROOT  # For bash
+  cd verilator
+  git pull        # Make sure we're up-to-date
+  git checkout v4.040
+  autoconf        # Create ./configure script
+  ./configure --prefix ~/tools
+  make -j$(nproc)
+  make install
+  cd ..
+}
+
+install_ghdl(){
+  sudo apt install -y gnat-9  libgnat-9 zlib1g-dev libboost-dev
+  git clone https://github.com/ghdl/ghdl ghdl-build && cd ghdl-build
+  git reset --hard "0316f95368837dc163173e7ca52f37ecd8d3591d"
+  mkdir build
+  cd build
+  ../configure --prefix=~/tools
+  make -j$(nproc)
+  make install
+  cd ..
+}
+
+install_iverilog(){
+  sudo apt install -y gperf readline-common bison flex libfl-dev
+  curl -fsSL https://github.com/steveicarus/iverilog/archive/v10_3.tar.gz | tar -xvz
+  cd iverilog-10_3
+  autoconf
+  ./configure  --prefix ~/tools
+  make -j$(nproc)
+  make install
+  cd ..
+}
+
+install_cocotb(){
+  pip3 install --user cocotb
+  sudo apt install -y git make gcc g++ swig python3-dev
+}
+
+purge_cocotb(){
+  # Force cocotb to compile VPI to avoid race condition when tests are start in parallel
+  cd tester/src/test/python/spinal/Dummy
+  make TOPLEVEL_LANG=verilog
+  make TOPLEVEL_LANG=vhdl
+  cd ../../../../../..
+}
+
+install_packages(){
+  sudo apt install -y gnat-9  libgnat-9 zlib1g-dev libboost-dev
+}
+
+install_tools(){
+  install_verilator
+  install_ghdl
+  install_iverilog
+  install_cocotb
+}