[docker] update workflow

- run on every push to master
- build images from GitHub source instead of PyPI package
- build arm64 image (#5227)
- include more tags
  - build date as 'YYYYMMDD'
  - 'dev' for most recent build from master
  - 'latest' for most recent release build

Dockerfile

@@ -11,7 +11,7 @@ RUN : \
     && python3 -B -m pip --no-cache-dir --no-input --disable-pip-version-check install -U \
         pip \
     && python3 -B -m pip --no-cache-dir --no-input --disable-pip-version-check install -U \
-        gallery-dl \
+        https://github.com/mikf/gallery-dl/archive/refs/heads/master.tar.gz \
         yt-dlp \
     && rm -rf /root/.cache/pip \
     && :