Build wheels for releases by using github actions.

pragmatic bash code to build and add wheels to releases

.github/workflows/build.yml

@@ -0,0 +1,64 @@
+name: Wheel builder
+
+on:
+  release:
+    types: [published,edited]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: contains(github.event.release.body, '<!--build-->')
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: [3.7, 3.8, 3.9]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Creating environment variables
+      run: |
+        github_tag="${GITHUB_REF#refs/tags/}"
+        echo "GITHUB_TAG=${github_tag}" >> "$GITHUB_ENV"
+        echo "GITHUB_RELEASE_API_URL=${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/releases/tags/${github_tag}" >> "$GITHUB_ENV"
+        echo "GITHUB_TAG_FOLDER=tag_data" >> "$GITHUB_ENV"
+    - name: Install dependencies
+      run: |
+        sudo apt install -y libx11-dev libxext-dev libxres-dev jq
+        python -m pip install --upgrade pip
+        python -m pip install --upgrade wheel
+    - name: Download release and extracting
+      run: |
+        code_archive_url="$(curl --header "Accept: application/vnd.github.v3+json" "${GITHUB_RELEASE_API_URL}" | jq --raw-output .zipball_url)"
+        echo downloading "${code_archive_url}"
+        wget --output-document="release.zip" "${code_archive_url}"
+        # the folder name in the archive may change
+        # so create a new folder so we can use globs
+        # without having to fear the existence of other folders
+        mkdir "${GITHUB_TAG_FOLDER}"
+        cd "${GITHUB_TAG_FOLDER}"
+        unzip ../release.zip
+    - name: building
+      run: |
+        cd "${GITHUB_TAG_FOLDER}"/*/
+        python setup.py bdist_wheel
+    - name: uploading
+      run: |
+        upload_url="$(curl --header "Accept: application/vnd.github.v3+json" "${GITHUB_RELEASE_API_URL}" | jq --raw-output .upload_url)"
+        upload_url="${upload_url%{*}"
+
+        cd "${GITHUB_TAG_FOLDER}"/*/
+        for filename in dist/*; do
+          echo uploading "${filename}"
+          filename_encoded="$(printf '%s' "${filename#*/}" | jq --slurp --raw-input --raw-output @uri)"
+          echo encoded filename "${filename_encoded}"
+          curl --request POST \
+          --header "Accept: application/vnd.github.v3+json" \
+          --header 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' \
+          --header "Content-Type: application/octet-stream" \
+          --data-binary @"${filename}" \
+          "${upload_url}?name=${filename_encoded}"
+        done