ci: Setup GitHub Actions to run unit tests

.github/workflows/ci.yml

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+name: CI
+
+on: [push]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        tmux_version:
+          - "2.6"
+          - "2.7"
+          - "2.8"
+          - "2.9a"
+          - "3.0a"
+    steps:
+      - name: Set up Go 1.13
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.13
+      - name: Check out the code
+        uses: actions/checkout@v1
+      - name: Install Tmux ${{ matrix.tmux_version }}
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y bc build-essential libevent-dev libncurses5-dev
+          wget https://github.com/tmux/tmux/releases/download/${{ matrix.tmux_version }}/tmux-${{ matrix.tmux_version }}.tar.gz
+          tar -zxf tmux-${{ matrix.tmux_version }}.tar.gz
+          cd tmux-${{ matrix.tmux_version }}
+          ./configure && make && sudo make install
+          cd ..
+      - name: Run all tests
+        run: make test

Makefile

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+default: test
+
+.PHONY: lint
+lint:
+	cd test && golangci-lint run -v
+
+.PHONY: test
+test:
+	cd test && go test -v