Manually install luacheck for CI

.github/workflows/main.yml

@@ -49,8 +49,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Enter nvim config home
-        run: cd symlinks/config/nvim
       - name: Run stylua
         uses: JohnnyMorganz/stylua-action@1.0.0
         with:
@@ -60,9 +58,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Enter nvim config home
-        run: cd symlinks/config/nvim
+      - name: Install luacheck
+        run: sudo apt-get install -y lua-check
       - name: Run luacheck
-        uses: lunarmodules/luacheck@v0.26.0
-        with:
-          args: symlinks/config/nvim
+        run: |
+          cd symlinks/config/nvim
+          luacheck .