WIP: Add linux support

.github/workflows/swift.yml

@@ -32,6 +32,36 @@ jobs:
     - name: Upload Pages artifact
       uses: actions/upload-pages-artifact@v2
 
+  build-linux:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+      with:
+        submodules: recursive
+    - uses: swift-actions/setup-swift@v2
+    - name: Build
+      run: swift build -v
+    - name: Run tests
+      run: swift test -v
+
+  build-oss:
+
+    runs-on: macos-13
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+      with:
+        submodules: recursive
+    - uses: swift-actions/setup-swift@v2
+    - name: Build
+      run: swift build -v
+    - name: Run tests
+      run: swift test -v
+
   deploy:
     needs: build
     if: ${{ github.ref == 'refs/heads/main' }}

Sources/Lua/LuaFoundation.swift

@@ -4,6 +4,7 @@
 #if !LUASWIFT_NO_FOUNDATION // canImport(Foundation)
 
 import Foundation
+import CoreFoundation
 import CLua
 
 /// Represents all the String encodings that this framework can convert strings to and from.

Sources/Lua/LuaState.swift

@@ -937,7 +937,12 @@ extension UnsafeMutablePointer where Pointee == lua_State {
             if let intVal = tointeger(index) {
                 // Integers are returned type-erased (thanks to AnyHashable) meaning fewer cast restrictions in
                 // eg tovalue()
+#if LUASWIFT_NO_FOUNDATION
                 return AnyHashable(intVal)
+#else
+                // TODO: There's a big ol' comment to go here...
+                return AnyHashable(NSNumber(value: intVal))
+#endif
             } else {
                 return tonumber(index)
             }

Tests/lua-test/LuaTests.swift

@@ -4,6 +4,8 @@
 import XCTest
 import Lua
 import CLua
+import Foundation
+import CoreFoundation
 
 fileprivate func dummyFn(_ L: LuaState!) -> CInt {
     return 0