* Add `LD_PRELOAD` to startup script
Closes#131
* Script to download and extract a JCEF release
Closely mirrors what KCEF does, but written in glorious AWK
* Call kcef_download and link downloaded JCEF where Suwayomi expects it
The script downloads JCEF into /opt. Link this folder at runtime into
the data folder where Suwayomi expects it. This allows us to easily
bundle the predownloaded release without modifying Suwayomi startup.
Move `LD_PRELOAD` down a bit to avoid warnings about preloading
libcef.so before the symlink exists.
* Add KCEF url to workflow to embed JCEF into container
