chore: add github workflow to run tests

.github/workflows/install_nvim.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+PLUGINS="$HOME/.local/share/nvim/site/pack/plugins/start"
+mkdir -p "$PLUGINS"
+
+wget https://github.com/neovim/neovim/releases/download/${NVIM_TAG}/nvim.appimage
+chmod +x nvim.appimage
+sudo mv ./nvim.appimage /usr/bin/nvim
+git clone --depth=1 https://github.com/nvim-lua/plenary.nvim.git "$PLUGINS/plenary.nvim"

.github/workflows/tests.yml

@@ -0,0 +1,24 @@
+name: Run tests
+
+on: [push, pull_request]
+
+jobs:
+  run_tests:
+    strategy:
+      matrix:
+        nvim_tag: [v0.5.0, v0.5.1, v0.6.0]
+
+    name: Run tests
+    runs-on: ubuntu-latest
+    env:
+      NVIM_TAG: ${{ matrix.nvim_tag }}
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install Neovim and dependencies
+        run: |
+          bash ./.github/workflows/install_nvim.sh
+
+      - name: Run tests
+        run: |
+          bash ./run_tests.sh