feat(ci): basic github action

.github/workflows/ci.yml

@@ -0,0 +1,63 @@
+name: ci
+on: [push, pull_request]
+
+env:
+  XDG_CACHE_HOME: ${{ github.workspace }}/.cache
+
+jobs:
+
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v1
+
+      - name: Install Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+
+      - name: Cache bigger downloads
+        uses: actions/cache@v2
+        id: cache
+        with:
+          path: ${{ github.workspace }}/.cache
+          key: ${{ runner.os }}-${{ hashFiles('package*json', '*config.js') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ hashFiles('package*json', '*config.js') }}
+            ${{ runner.os }}-
+
+      - name: Install dependencies
+        run: npm run ci:install # TODO npm ci --prefer-offline --no-audit --progress=false --cache ${{ github.workspace }}/.cache/npm
+
+      - name: Build
+        run: npm run build
+
+      - name: Show build/
+        run: du -sh build/ && ls -l build/
+
+      - name: Test
+        run: npm run test
+
+      - name: Lint
+        run: npm run lint
+
+      # Persist produced binaries and effective config used for building them
+      # - this is not for releases, but for quick testing during the dev
+      # - action artifacts can be downloaded for 90 days, then are removed by github
+      # - binaries in PRs from forks won't be signed
+      - name: Attach produced packages to Github Action
+        uses: actions/upload-artifact@v2
+        with:
+          name: build-${{ matrix.os }}
+          path: build/ipfs_companion*.*
+          if-no-files-found: error
+
+      - name: Show Cache
+        run: du -sh ${{ github.workspace }}/.cache/ && ls -l ${{ github.workspace }}/.cache/
+