Fix #199 (#253)

* Test

* Only run examples

* Build step

* Headless window when env THREE_D_CI is set

* Set THREE_D_CI env variable

* Fix

* fix

* Println

* Revert "Println"

This reverts commit 2716991.

* Revert "Only run examples"

This reverts commit 6cea97b.

.github/workflows/rust.yml

@@ -6,6 +6,7 @@ env:
   CARGO_TERM_COLOR: always
   RUST_BACKTRACE: 1
   THREE_D_EXIT: 300
+  THREE_D_CI: 1
 
 jobs:
   desktop:
@@ -89,4 +90,17 @@ jobs:
           toolchain: stable
           override: true
 
-      - run: xvfb-run cargo run --example headless --no-default-features --features "glutin-window image-io"
+      - name: Build
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --all-features
+
+      - run: |
+          for example in `find examples -maxdepth 1 -mindepth 1 -type d -printf "%f\n"` ; do
+            if [ -f "examples/$example/Cargo.toml" ]; then
+              echo "::group::Run $example example"
+              xvfb-run -a cargo run --example $example --all-features
+              echo "::endgroup::"
+            fi
+          done