build and upload executables created by PyInstaller

- create release on tag push
- build executables by PyInstaller:
    - extract_otp_secrets_linux_x86_64 (glibc 2.28)
    - extract_otp_secrets_win_x86_64.exe
    - extract_otp_secrets_macos_x86_64 (untested)
- add --version
- build linux executable in docker container
- update README
    - add TOC
    - improve badges
    - add PyInstaller section
- docker
    - build BASE_IMAGE as ARG
    - copy only required files to image
    - add .alias
- build.sh
    - fix clean
    - fix generate results
    - generate TOC

.github/workflows/ci.yml

@@ -7,6 +7,8 @@ name: tests
 
 on:
   push:
+    paths-ignore:
+      - 'docs/**'
   # pull_request:
   schedule:
     # Run daily on default branch
@@ -29,6 +31,7 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+          check-latest: false
       - name: Install zbar shared lib for QReader (Linux)
         if: runner.os == 'Linux'
         run: |