Update the Github Actions workflow

Since we have custom Lua & Luarocks now, we can't use the leafo actions.

.github/workflows/ci.yml

@@ -7,8 +7,6 @@
 # Useful reference:
 #   - https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions
 #   - https://github.com/actions/checkout
-#   - https://github.com/leafo/gh-actions-lua
-#   - https://github.com/leafo/gh-actions-luarocks
 
 name: Github Actions CI
 
@@ -24,36 +22,68 @@ on:
     pull_request:
         branches: [ master ]
 
+env:
+    LUA_VERSION: 5.4.4
+    LUAROCKS_VERSION: 3.9.0
+
 jobs:
     lint:
         name: Lint
         runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v2
-            - uses: leafo/[email protected]
-            - uses: leafo/[email protected]
+
+            - name: Install Lua
+              run: |
+                  wget -O - https://github.com/pallene-lang/lua-internals/archive/refs/tags/${{env.LUA_VERSION}}.tar.gz | tar xzf -
+                  cd lua-internals-${{env.LUA_VERSION}}
+                  make linux
+                  sudo make install
+
+            - name: Install Luarocks
+              run: |
+                  wget -O - https://luarocks.org/releases/luarocks-${{env.LUAROCKS_VERSION}}.tar.gz | tar xzf -
+                  cd luarocks-${{env.LUAROCKS_VERSION}}
+                  ./configure --with-lua=/usr/local
+                  make
+                  sudo make install
 
             - name: Install Luacheck
-              run: luarocks install luacheck
+              run: luarocks install --local luacheck
 
             - name: Run Luacheck
-              run: ./run-lint
+              run: |
+                  eval "$(luarocks path)"
+                  ./run-lint
 
     test:
         name: Test
         runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v2
-            - uses: leafo/[email protected]
-            - uses: leafo/[email protected]
 
-            - name: Build
+            - name: Install Lua
+              run: |
+                  wget -O - https://github.com/pallene-lang/lua-internals/archive/refs/tags/${{env.LUA_VERSION}}.tar.gz | tar xzf -
+                  cd lua-internals-${{env.LUA_VERSION}}
+                  make linux
+                  sudo make install
+
+            - name: Install Luarocks
               run: |
-                  luarocks make
-                  (cd vm && make linux)
+                  wget -O - https://luarocks.org/releases/luarocks-${{env.LUAROCKS_VERSION}}.tar.gz | tar xzf -
+                  cd luarocks-${{env.LUAROCKS_VERSION}}
+                  ./configure --with-lua=/usr/local
+                  make
+                  sudo make install
+
+            - name: Build
+              run: luarocks --local make
 
             - name: Install Busted
-              run: luarocks install busted
+              run: luarocks --local install busted
 
             - name: Run Tests
-              run: busted -o gtest -v ./spec
+              run: |
+                  eval "$(luarocks path)"
+                  busted -o gtest -v ./spec