add workflows

.github/CODEOWNERS

@@ -0,0 +1,3 @@
+package.ts @thomasnordquist
+.github @thomasnordquist
+scripts @thomasnordquist

.github/workflows/cd.yml

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+name: Build
+
+on:
+  push:
+    branches:
+      - master
+      - tnordquist/add-workflows
+
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: false
+
+jobs:
+  platform_matrix:
+    strategy:
+      matrix:
+        build:
+          - os: ubuntu-latest
+            task: linux
+          - os: windows-latest
+            task: win
+          - os: macos-latest
+            task: mac
+    runs-on: ${{ matrix.build.os }}
+    steps:
+      - if: matrix.build.os == 'ubuntu-latest'
+        run: sudo snap install snapcraft --classic
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+      - run: npm install -g yarn
+      - run: yarn
+      - run: yarn build
+      - run: yarn prepare-release
+      - run: yarn package ${{ matrix.build.task }}
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_STORE_CREDENTIALS }}