ci: add wasm32 cargo flags

.cargo/config.toml

@@ -0,0 +1,28 @@
+[target.wasm32-unknown-emscripten]
+rustflags = [
+    "-C",
+    "link-arg=-s",
+    "-C",
+    "link-arg=FULL_ES2",
+    "-C",
+    "link-arg=-s",
+    "-C",
+    "link-arg=FULL_ES3",
+    "-C",
+    "link-arg=-s",
+    "-C",
+    "link-arg=USE_SDL=2",
+    "-C",
+    "link-arg=-s",
+    "-C",
+    "link-arg=MAX_WEBGL_VERSION=2 ",
+    "-C",
+    "link-arg=-s",
+    "-C",
+    "link-arg=MIN_WEBGL_VERSION=2",
+    "-C",
+    "link-arg=-s",
+    "-C",
+    "link-arg=ERROR_ON_UNDEFINED_SYMBOLS=0", # for ignoring some egl symbols. needed for wgpu
+
+]