add github workflows for build, test and publishing

.github/workflows/main.yml

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+name: Common Test
+
+on:
+  pull_request:
+    branches:
+      - 'master'
+  push:
+    branches:
+      - 'master'
+
+jobs:
+  build:
+    name: Test on OTP ${{ matrix.otp_version }} and ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        otp_version: [19, 20, 21, 22, 23]
+        os: [ubuntu-latest]
+
+    container:
+      image: erlang:${{ matrix.otp_version }}
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Compile
+      run: ./bootstrap
+    - name: CT tests
+      run: ./rebar3 ct

.github/workflows/publish.yml

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+name: Publish
+
+on:
+  release:
+    types: [published, prereleased]
+
+jobs:
+  build:
+    name: Publish escript to release
+    runs-on: ubuntu-latest
+
+    container:
+      image: erlang:19
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Compile
+      run: ./bootstrap
+    - name: CT tests
+      run: ./rebar3 ct
+
+    - name: Upload Release Asset
+      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: ./rebar3
+        asset_name: rebar3
+        asset_content_type: application/zip
+
+    - name: Configure AWS credentials
+      if: "!github.event.release.prerelease"
+      uses: aws-actions/configure-aws-credentials@v1
+      with:
+        aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
+        aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+        aws-region: us-east-1
+
+    - name: Copy rebar3 escript to S3
+      if: "!github.event.release.prerelease"
+      run: |
+        aws s3 sync ./rebar3 s3://rebar3