ci: Push images to GitHub Container Registry

[bjw-s]

This PR should add support for pushing container images to GitHub Container Registry under the valkey-io organization.

The resulting images will be tagged as ghcr.io/valkey-io/valkey:<tag>

List of tags that will be created

• ghcr.io/valkey-io/valkey:unstable
• ghcr.io/valkey-io/valkey:unstable-bookworm
• ghcr.io/valkey-io/valkey:unstable-alpine
• ghcr.io/valkey-io/valkey:unstable-alpine3.21
• ghcr.io/valkey-io/valkey:8.0.2
• ghcr.io/valkey-io/valkey:8.0
• ghcr.io/valkey-io/valkey:8
• ghcr.io/valkey-io/valkey:latest
• ghcr.io/valkey-io/valkey:8.0.2-bookworm
• ghcr.io/valkey-io/valkey:8.0-bookworm
• ghcr.io/valkey-io/valkey:8-bookworm
• ghcr.io/valkey-io/valkey:bookworm
• ghcr.io/valkey-io/valkey:8.0.2-alpine
• ghcr.io/valkey-io/valkey:8.0-alpine
• ghcr.io/valkey-io/valkey:8-alpine
• ghcr.io/valkey-io/valkey:alpine
• ghcr.io/valkey-io/valkey:8.0.2-alpine3.21
• ghcr.io/valkey-io/valkey:8.0-alpine3.21
• ghcr.io/valkey-io/valkey:8-alpine3.21
• ghcr.io/valkey-io/valkey:alpine3.21
• ghcr.io/valkey-io/valkey:8.1.0-rc1
• ghcr.io/valkey-io/valkey:8.1
• ghcr.io/valkey-io/valkey:8.1.0-rc1-bookworm
• ghcr.io/valkey-io/valkey:8.1-bookworm
• ghcr.io/valkey-io/valkey:8.1.0-rc1-alpine
• ghcr.io/valkey-io/valkey:8.1-alpine
• ghcr.io/valkey-io/valkey:8.1.0-rc1-alpine3.21
• ghcr.io/valkey-io/valkey:8.1-alpine3.21
• ghcr.io/valkey-io/valkey:7.2.8
• ghcr.io/valkey-io/valkey:7.2
• ghcr.io/valkey-io/valkey:7
• ghcr.io/valkey-io/valkey:7.2.8-bookworm
• ghcr.io/valkey-io/valkey:7.2-bookworm
• ghcr.io/valkey-io/valkey:7-bookworm
• ghcr.io/valkey-io/valkey:7.2.8-alpine
• ghcr.io/valkey-io/valkey:7.2-alpine
• ghcr.io/valkey-io/valkey:7-alpine
• ghcr.io/valkey-io/valkey:7.2.8-alpine3.21
• ghcr.io/valkey-io/valkey:7.2-alpine3.21
• ghcr.io/valkey-io/valkey:7-alpine3.21

Partly implements #17

[roshkhatri]

Does this PR have any pre-requisites setup required from the valkey-io org to publish on ghcr, before we merge this?

[roshkhatri]

Can you also mention the Tags are getting created by the workflows? and also the results on the GHCR? you can add everything to the top comment.

Thanks!

[bjw-s]

Does this PR have any pre-requisites setup required from the valkey-io org to publish on ghcr, before we merge this?

Everything should be good to go without any changes. The permissions snippet on the build job ensures that the temporary GitHub token is allowed to write content to the GitHub registry.

Can you also mention the Tags are getting created by the workflows? and also the results on the GHCR? you can add everything to the top comment.

Done 👍 I have also added a quick mention to the project README.