Move docker build to github workflow

[testower]

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[sonarcloud]

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[derhuerst]

Note that the Docker image, as currently built by Jib, lacks the following:

• a README.md, which Docker Hub would pick up and render
• OCI image annotations like org.opencontainers.image.documentation or org.opencontainers.image.licenses, which various Docker-related tools read and display to provide a better DX

[testower]

Note that the Docker image, as currently built by Jib, lacks the following:

• a README.md, which Docker Hub would pick up and render
• OCI image annotations like org.opencontainers.image.documentation or org.opencontainers.image.licenses, which various Docker-related tools read and display to provide a better DX

Thanks, could you add this comment to #249 - I'll look into it there