Add GitHub Actions (#3)

.github/workflows/build_and_release.yml

@@ -0,0 +1,54 @@
+name: CI
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build_and_release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Fetch lovr exe
+        run: |
+          curl https://lovr.org/download -L -o lovr.zip
+          unzip lovr.zip -d layout
+
+      - name: Package Layout
+        run: |
+          cd src
+          zip -0qr layout.lovr .
+          cat ../layout/lovr.exe layout.lovr > ../layout/layout.exe
+          cd ../layout
+          rm lovr.exe
+          zip -9qr layout.zip .
+
+      - name: Set version number
+        id: set_version
+        run: echo ::set-output name=VERSION::${GITHUB_REF#refs/tags/}
+
+      - name: Create release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ steps.set_version.outputs.VERSION }}
+          release_name: Layout ${{ steps.set_version.outputs.VERSION }}
+          body: Layout ${{ steps.set_version.outputs.VERSION }}
+          draft: false
+          prerelease: false
+
+      - name: Upload Layout artifact
+        id: upload-release-asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./layout/layout.zip
+          asset_name: layout.zip
+          asset_content_type: application/zip