Fix Build and Push Container Image

[yadirhb]

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Here again with a few changes to hopefully fix the issues we have:

• Updated the failing cleanup to depend on different action.
• Added triggers for the workflow: push and pull_request so it triggers automatically. This was removed while I was fighting with rebase conflicts last week.
• Fixed build number fixed to 100 due to checkout action always pulling only the last 100 commits.

[yadirhb]

@ikawrakow here some fixes for #1611. Still please check if in your package Settings page you have your repo ik_llama.cpp listed with Write permission. It should look like this:

... as I see:

ERROR: target server: failed to solve: failed to push ghcr.io/ikawrakow/ik-llama-cpp:cpu-server-4418: denied: installation not allowed to Write organization package
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[ikawrakow]

Here is what I have in the settings

[yadirhb]

Here is what I have in the settings

Ok, just updated the workflow again and also tested the permissions. Write permission is not enough, it needs to be Admin so the cleanup step can Delete untagged packages from the registry.