Add GitHub Actions workflow

.github/scripts/install-gambit.sh

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+#!/usr/bin/env bash
+
+if [ ! -f $HOME/gambit/bin/gsi ]; then
+  wget http://www.iro.umontreal.ca/~gambit/download/gambit/v4.9/source/gambit-v4_9_3.tgz
+  tar xzvf gambit-v4_9_3.tgz
+  pushd gambit-v4_9_3
+  ./configure --prefix=$HOME/gambit --enable-single-host
+  make
+  make install
+  popd
+fi
+
+sudo ln -sf $HOME/gambit/bin/gsi /bin/gsi
+sudo ln -sf $HOME/gambit/bin/gsi-script /bin/gsi-script
+sudo ln -sf $HOME/gambit/bin/gsc /bin/gsc

.github/workflows/ci.yml

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+name: CI
+on: [push, pull_request]
+jobs:
+  install-gambit:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install dependencies
+        run: sudo apt-get -y install openssl libssl-dev sqlite3 libsqlite3-dev
+      - name: Install Gambit
+        run: ./.github/scripts/install-gambit.sh
+      - name: Cache gambit
+        uses: actions/cache@v2
+        env:
+          cache-name: gambit
+        with:
+          path: $HOME/gambit
+          key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('$HOME/gambit/bin/gsi') }}
+  build-test:
+    runs-on: ubuntu-latest
+    needs: install-gambit
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build
+        run: |
+          echo "(define (gerbil-version-string) \"git-$(git rev-parse --short=8 HEAD)\")" > src/gerbil/runtime/gx-version.scm
+          export GERBIL_HOME=${GITHUB_WORKSPACE}
+          cd src
+          ./build.sh gxi
+          ./build.sh stage0
+          ./build.sh stage1 final
+          ./build.sh stdlib
+          ./build.sh lang
+          ./build.sh tools
+          export PATH=${GITHUB_WORKSPACE}/bin:$PATH
+      - name: Run tests
+        run: ./std/run-tests.ss