fix: prevent deletion of model files shared by multiple configurations

[Copilot]

Fixes #7171 - When deleting a model configuration, LocalAI was incorrectly removing model files still referenced by other configurations.

Root Cause

Two bugs in DeleteModelFromSystem:

1. Line 376: Logic error using OR instead of AND for file extension filtering

   // Before: Skips ALL files (no file has both extensions)
   if !strings.HasSuffix(f.Name(), ".yaml") || !strings.HasSuffix(f.Name(), ".yml")
   
   // After: Skips only non-YAML files
   if !strings.HasSuffix(f.Name(), ".yaml") && !strings.HasSuffix(f.Name(), ".yml")

2. Line 379: Incorrect filename comparison prevents skipping the config being deleted

   // Before: Compares "model1.yaml" with "model1" - never matches
   if f.Name() == name
   
   // After: Properly compares full filenames
   if f.Name() == fmt.Sprintf("%s.yaml", name) || f.Name() == fmt.Sprintf("%s.yml", name)

Changes

• Fixed both bugs in core/gallery/models.go
• Added Ginkgo test that verifies:
  • Shared model files are preserved when one config is deleted
  • Shared model files are removed only when all referencing configs are deleted

Test Case

// Setup: Two configs sharing the same model file
model1.yaml -> shared_model.bin
model2.yaml -> shared_model.bin

// Delete model1 -> shared_model.bin remains (model2 still uses it)
// Delete model2 -> shared_model.bin removed (no references)

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn01.quay.io
  • Triggering command: /tmp/go-build1857095799/b001/gallery.test -test.testlogfile=/tmp/go-build1857095799/b001/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true (dns block)
• huggingface.co
  • Triggering command: /tmp/go-build709347668/b001/gallery.test -test.paniconexit0 -test.timeout=10m0s -test.v=true -ginkgo.focus=does not delete shared model files (dns block)
  • Triggering command: /tmp/go-build1857095799/b001/gallery.test -test.testlogfile=/tmp/go-build1857095799/b001/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)