chore: use yamlfmt for all yaml files (but not helm templates)

[corneliusroemer]

Summary

• Add yamlfmt config to root
• Recommend yamlfmt vscode extension

This formatter with current config doesn't wrap long lines, which saves us a lot of lines.

Install formatter with:

go install github.com/google/yamlfmt/cmd/yamlfmt@latest

Blog writeup on the formatter: https://til.simonwillison.net/yaml/yamlfmt

Alternative to #2124

[anna-parker]

Could you check if this formatter also for some reasons breaks kubernetes/loculus/templates/keycloak-config-map.yaml? #2124 (review)

[anna-parker]

@corneliusroemer I just installed using the instructions in https://github.com/google/yamlfmt and tried to run

$ yamlfmt .                             

encountered the following formatting errors:
loculus/templates/loculus-backend-service.yaml: yaml: line 5: did not find expected node content
loculus/templates/loculus-database-service.yaml: yaml: did not find expected node content
loculus/templates/loculus-database-standin.yaml: yaml: did not find expected node content
loculus/templates/keycloak-service.yaml: yaml: line 5: did not find expected node content
loculus/templates/keycloak-database-deployment.yaml: yaml: did not find expected node content
loculus/templates/ingest-deployment.yaml: yaml: did not find expected node content
loculus/templates/keycloak-deployment.yaml: yaml: did not find expected node content
loculus/templates/loculus-preprocessing-config.yaml: yaml: did not find expected node content
loculus/templates/lapis-silo-database-config.yaml: yaml: did not find expected node content
loculus/templates/lapis-silo-deployment.yaml: yaml: did not find expected node content
loculus/templates/secrets.yaml: yaml: did not find expected node content
loculus/templates/ingressroute.yaml: yaml: line 7: did not find expected node content
loculus/templates/loculus-preprocessing-deployment.yaml: yaml: did not find expected node content
loculus/templates/lapis-service.yaml: yaml: did not find expected node content
loculus/templates/lapis-ingress.yaml: yaml: did not find expected node content
loculus/templates/website-service.yaml: yaml: line 5: did not find expected node content
loculus/templates/ingest-config.yaml: yaml: did not find expected node content
loculus/templates/loculus-backend.yaml: yaml: did not find expected node content
loculus/templates/loculus-website.yaml: yaml: did not find expected node content
loculus/templates/loculus-website-config.yaml: yaml: did not find expected node content
loculus/templates/keycloak-database-service.yaml: yaml: did not find expected node content
loculus/templates/keycloak-config-map.yaml: yaml: did not find expected node content

It looks like this still has some issues for helm charts: google/yamlfmt#114

[anna-parker]

Decided to create a new comment for clarity. From reading the issue this just means that this formatter will skip over helm templates - which is actually good as the other formatter that I tried: https://marketplace.visualstudio.com/items?itemName=redhat.vscode-yaml didn't do this and because of that incorrectly reformatted sections of the template.

So I am very happy with switching to this formatter :-)

[github-actions]

✅dependabot config looks good 👍