Add label of scaffolded middleware version to function image

[creydr]

Changes

• 🎁 Add the middleware version which was used during scaffolding as a label (middleware-version) to the function image
  • as we use scaffolding ATM only for s2i and host builder, this is only supported/added when one of those two builders is used

For example on a Golang build:

$ ~/development/knative-func/func build --registry quay.io/creydr/func-go-hello-world  --push --builder host        
Building function image
   f.linux.amd64
   f.linux.arm64
   f.linux.arm.v7
🙌 Function built: quay.io/creydr/func-go-hello-world/func-go-hello-world:latest

$ skopeo inspect --no-tags --tls-verify=false docker://quay.io/creydr/func-go-hello-world/func-go-hello-world:latest
{
    "Name": "quay.io/creydr/func-go-hello-world/func-go-hello-world",
    ...
    "Labels": {
        "middleware-version": "v0.21.3"
    },
   ...
}

/kind enhancement

TODOs / Follow-ups:

• we don't have a middlewareVersionDetector for Rust yet
• Provide this information as part of func describe (maybe only in -o json|yaml)
• Think about adding information about the middleware package (e.g. func-python, ...) as a label too

Release Note

Provide used middleware version as a function label

[codecov]

Codecov Report

❌ Patch coverage is 52.10526% with 91 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.56%. Comparing base (859ef43) to head (42bcf8a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/scaffolding/middleware_version.go	50.00%	65 Missing and 16 partials ⚠️
pkg/oci/builder.go	61.11%	4 Missing and 3 partials ⚠️
pkg/s2i/builder.go	70.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3270      +/-   ##
==========================================
+ Coverage   53.87%   54.56%   +0.69%     
==========================================
  Files         166      167       +1     
  Lines       19280    19466     +186     
==========================================
+ Hits        10387    10622     +235     
+ Misses       7888     7784     -104     
- Partials     1005     1060      +55     

Flag	Coverage Δ
e2e	39.71% <19.72%> (+1.39%)	⬆️
e2e go	35.70% <19.72%> (?)
e2e node	30.94% <0.00%> (?)
e2e python	35.37% <22.44%> (?)
e2e quarkus	31.09% <0.00%> (?)
e2e rust	30.54% <0.00%> (-0.33%)	⬇️
e2e springboot	30.57% <0.00%> (-0.33%)	⬇️
e2e typescript	31.05% <0.00%> (-0.33%)	⬇️
integration	17.67% <0.00%> (-0.18%)	⬇️
unit macos-14	44.50% <47.61%> (+0.02%)	⬆️
unit macos-latest	44.50% <47.61%> (+0.02%)	⬆️
unit ubuntu-24.04-arm	44.68% <46.84%> (+0.01%)	⬆️
unit ubuntu-latest	45.42% <47.61%> (+0.01%)	⬆️
unit windows-latest	44.52% <47.61%> (+0.02%)	⬆️

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[creydr]

/cc @gauron99

[gauron99]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, gauron99

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• OWNERS [gauron99]

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[gauron99]

thanks Christoph!