ci: add egui and sdl2 build tests

.woodpecker/build_egui.yaml

@@ -0,0 +1,10 @@
+matrix:
+  RUST: [nightly]
+
+steps:
+  build_egui:
+    image: rust
+    environment: [CARGO_TERM_COLOR=always]
+    commands:
+      - rustup default $RUST
+      - cargo build --features "egui" --bin "topola-egui"

.woodpecker/build_sdl2.yaml

@@ -0,0 +1,10 @@
+matrix:
+  RUST: [nightly]
+
+steps:
+  build_sdl2:
+    image: rust
+    environment: [CARGO_TERM_COLOR=always]
+    commands:
+      - rustup default $RUST
+      - cargo build --features "sdl2" --bin "topola-sdl2-demo"