Fix integration tests

[dmcgowan]

Currently only a few tests are there, but running the integration tests is useful to show vm startup and init are working

[Copilot]

Pull request overview

This pull request fixes integration tests to demonstrate that VM startup and initialization are working correctly. The changes add a new test execution script and modify the test setup to properly handle PATH configuration and temporary directory resolution on different platforms (particularly macOS).

Changes:

• Added new shell script integration/test.sh to build and run integration tests individually
• Updated integration/main_test.go to improve PATH setup and handle symlink resolution for temp directories
• Added Makefile target test-integration to build test binary and execute tests using gotestsum
• Updated libkrun version from v1.15.1 to v1.17.4 and added required libcap-ng-dev dependency

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.

File	Description
integration/test.sh	New shell script to build test binary (with macOS code signing) and execute integration tests individually
integration/main_test.go	Enhanced PATH setup to include executable directory and improved temp directory handling with symlink resolution
Makefile	Added integration test build target and test-integration target using gotestsum
Dockerfile	Updated libkrun to v1.17.4 and added libcap-ng-dev dependency for the build

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

Comments suppressed due to low confidence (1)

integration/main_test.go:81

• The error messages here use capitalized "Failed to..." which is inconsistent with the existing error messages in integration/vm_test.go that use lowercase "failed to...". For consistency within the integration package, consider using lowercase error messages.

				t.Fatal("Failed to get current working directory:", err)
			}
			vm, err := tc.vmm.NewInstance(t.Context(), resolvedTd)
			if err != nil {
				t.Fatal("Failed to create VM instance:", err)
			}

			if err := vm.Start(t.Context()); err != nil {
				t.Fatal("Failed to start VM instance:", err)

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