Try GitHub Actions for Linux CI

Author: linkmauve

.github/workflows/build.yml

@@ -0,0 +1,25 @@
+name: DeSmuME
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build:
+    name: Build DeSmuME
+    runs-on: ubuntu-20.04
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+
+      - name: install dependencies
+        run: sudo apt install meson libsdl1.2-dev libpcap-dev libgtk-3-dev
+
+      - name: meson
+        run: |
+          cd desmume/src/frontend/posix/
+          meson build
+
+      - name: ninja
+        run: ninja -C desmume/src/frontend/posix/build