add build to github actions

.github/workflows/build.yml

@@ -0,0 +1,60 @@
+name: "Build"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '43 2 * * 0'
+
+jobs:
+  build:
+    name: "build / binary"
+    strategy:
+      matrix:
+        os:
+          - ubuntu-20.04
+          - macos-latest
+#          - windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v1
+        with:
+          python-version: '3.9'
+      - id: os-name
+        uses: ASzc/change-string-case-action@v1
+        with:
+          string: ${{ runner.os }}
+      - name: set pip cache dir
+        id: pip-cache
+        run: echo "::set-output name=dir::$(pip cache dir)"
+      - name: extract pip cache
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.pip-cache.outputs.dir }}
+          key: ${{ runner.os }}-pip-${{ hashFiles('setup.py') }}
+          restore-keys: ${{ runner.os }}-pip-
+      - run: pip install pyinstaller==4.4
+      - run: pip install -e .
+      - if: startsWith(github.ref, 'refs/tags/v')
+        run: python docker/set_build.py
+      - if: startsWith(runner.os, 'linux') || startsWith(runner.os, 'mac')
+        name: Build & Run (Unix)
+        run: |
+          pyinstaller --onefile --name scribe scribe/blockchain/__main__.py
+          pyinstaller --onefile --name scribe-elastic-sync scribe/elasticsearch/__main__.py
+          pyinstaller --onefile --name scribe-hub scribe/hub/__main__.py
+          dist/scribe --version
+#      - if: startsWith(runner.os, 'windows')
+#        name: Build & Run (Windows)
+#        run: |
+#          pip install pywin32==301
+#          pyinstaller --additional-hooks-dir=scripts/. --icon=icons/lbry256.ico --onefile --name lbrynet lbry/extras/cli.py
+#          dist/lbrynet.exe --version
+      - uses: actions/upload-artifact@v2
+        with:
+          name: scribe-${{ steps.os-name.outputs.lowercase }}
+          path: dist/