Support for podman + more control on git branches

Summary of changes:

• podman is sought for if docker cannot be found
• Environment variable docker (useful to call podman-remote as a replacement for docker)
• Docker/Podman arguments can be passed before the command for LarvaTagger.jl (e.g. import/run/predict etc)
• Upgrade to julia 1.9 (Docker image)
• Environment variable LARVATAGGER_DEFAULT_BRANCH renamed LARVATAGGER_BRANCH
• Environment variable TAGGINGBACKENDS_BRANCH
• --with-backend MaggotUBA/<branch> to allow building the dev branch