This is just a short little post on how to manually publish images to GitHub Container Registry (GHCR). Looking at the documentation, the usual way to go seems to be to use GitHub Actions and automatically build and publish images onto the registry. However, I do have one use case where images aren’t built via GitHub Actions but offline on a machine of mine, yet I still want to make the images available via ghcr.io. It took me longer than it should have to figure out how to manually authenticate to ghcr.io, so here are the steps.
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How to download the latest GitHub repo release via command line
I just fiddled around a bit to find out how to download the latest GitHub release via the command line. Turns out that GitHub doesn’t provide a universal download URL to release binaries like it does for the release browser page itself. The latest release page can always be reached via https://github.com/ORGANIZATION/REPO/releases/latest, e.g. https://github.com/gvenzl/csv2db/releases/latest. Unfortunately that is not true for the binaries, which are available under https://github.com/ORGANIZATION/REPO/archive/RELEASE_TAG.zip and https://github.com/ORGANIZATION/REPO/archive/RELEASE_TAG.tar.gz but not under something generic like https://github.com/ORGANIZATION/REPO/archive/latest.zip and https://github.com/ORGANIZATION/REPO/archive/latest.tar.gz
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