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[CI] Unblock stale runners and fix modern Swift build errors #80

	name: Ubuntu

	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]

	jobs:
	ubuntu_test:
	name: Execute tests on Ubuntu
	strategy:
	fail-fast: false
	matrix:
	include:
	- swift_image: "5.9.2-jammy" # Swift 5.9.2 (minimum supported)
	- swift_image: "6.1-noble" # Current Swift
	runs-on: ubuntu-latest
	container: swift:${{ matrix.swift_image }}
	steps:
	- uses: actions/checkout@v4
	- name: Swift version
	run: swift --version
	- name: Building and running tests in debug mode with coverage
	run: \|
	swift test \
	-c debug \
	-Xswiftc -warnings-as-errors \
	--enable-code-coverage \
	--build-path .build-test-debug
	llvm-cov show \
	-instr-profile=.build-test-debug/debug/codecov/default.profdata \
	.build-test-debug/debug/OpenCombinePackageTests.xctest \
	> coverage.txt
	- name: Building and running tests in debug mode with TSan
	run: \|
	swift test \
	-c debug \
	--sanitize thread \
	--build-path .build-test-debug-sanitize-thread
	- name: Building and running tests in release mode
	run: \|
	swift test \
	-c release \
	-Xswiftc -warnings-as-errors \
	--build-path .build-test-release
	- uses: codecov/codecov-action@v4
	with:
	verbose: true