[Backport 7.x] Build dists in Docker during make.sh assemble

Co-authored-by: Seth Michael Larson <[email protected]>

.github/workflows/ci.yml

@@ -4,26 +4,6 @@ name: CI
 on: [push, pull_request]
 
 jobs:
-  package:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout Repository
-        uses: actions/checkout@v1
-      - name: Set up Python 3.7
-        uses: actions/setup-python@v1
-        with:
-          python-version: 3.7
-      - name: Install dependencies
-        run: |
-          python3.7 -m pip install setuptools wheel twine
-      - name: Build packages
-        run: |
-          python3.7 utils/build-dists.py
-      - name: Check packages
-        run: |
-          set -exo pipefail;
-          if [ $(python3.7 -m twine check dist/* | grep -c 'warning') != 0 ]; then exit 1; fi
-
   lint:
     runs-on: ubuntu-latest
     steps: