CI automated tarball creation and deployment

.gitattributes

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+# Archive: ignore dotfiles
+.* export-ignore
+.*/** export-ignore

.github/workflows/build.yml

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+name: Release tarball archive
+on:
+  push:
+    tags:
+    - '[0-9]*'
+jobs:
+  archive_source_code:
+    if: startsWith(github.ref, 'refs/tags/')
+    name: Source Code Tarball
+    runs-on: ubuntu-18.04
+    env:
+      ARCHIVE_BASENAME: jack1-${{ github.ref_name }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        submodules: recursive
+    - name: Dependencies setup
+      run: |
+        sudo apt-get update
+        sudo apt-get install python-pip
+        sudo pip install git-archive-all
+    - name: Archive source code
+      shell: bash
+      run: |
+        cd "${GITHUB_WORKSPACE}"
+        git-archive-all --prefix="${ARCHIVE_BASENAME}/" -9 "${{runner.workspace}}/${ARCHIVE_BASENAME}.tar.gz"
+    - uses: actions/upload-artifact@v2
+      with:
+        name: Source code tarball
+        path: ${{runner.workspace}}/${{env.ARCHIVE_BASENAME}}.tar.gz
+  deploy:
+    if: startsWith(github.ref, 'refs/tags/')
+    runs-on: ubuntu-18.04
+    needs:
+    - archive_source_code
+    steps:
+    - uses: actions/download-artifact@v2
+      with:
+        name: Source code tarball
+    - uses: softprops/action-gh-release@v1
+      env:
+        GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+      with:
+        tag_name: ${{ github.ref_name }}
+        name: Release ${{ github.ref_name }}
+        draft: false
+        prerelease: false
+        files: |
+          jack1-${{ github.ref_name }}.*