Suffix one off context builder images with short git sha

[nnarayen]

🚀 What

It's pretty easy to accidentally clobber existing context builder images:

• Forget to update version here
• Two people are iterating in parallel, and happen to use the same rcX identifier

This PR adds the git sha as a suffix to context builder images only for the one off jobs kicked off via github actions. Can see this successful job as an example.

New workflow:

• No longer need to update project version for every new context builder version you're testing
• In order to derive the image tag (for input into Billip, for instance), you can check build output or run

$ echo -n "$(poetry version | awk '{print $2}')-$(git rev-parse --short HEAD)" | pbcopy

Alternatives considered:

• Tooling to add the sha suffix to the poetry managed version, but poetry is opinionated that it should resemble a semver, which isn't necessarily compatible with Docker image tag formats

💻 How

🔬 Testing

[marius-baseten]

But does that mean that in order to point to that image, you need to add the SHA as well in the constance config override? That seems a bit cumbersome.

Can we instead reject overwrite of existing images, but not require extra version parts?