Update GDAL command to use built COG output format

[eliotjordan]

• Modifies geo derivative service to use built-in GDAL Cloud Optimized GeoTiff ouput format. Solves issue with improperly generated images.
• Updates CI docker image to latest base version to get the latest version of GDAL with the new format.
• Moves CI docker image from docker hub to GitHub packages to be more in line with other projects.
• Adds GitHub Actions task to build new docker images when the Dockerfile or dependency build scripts change.

Closes #6501

Tried in figgy staging. Generates correctly formatted COG.