feat: nix pg upgrade script example #2987

Job	Run time
build-run-image (large-linux-arm, arm64)	5m 43s
build-run-image (macos-latest-xlarge, arm64)	4m 12s
build-run-image (large-linux-x86, amd64)	2m 20s
run-tests / prepare	49s
run-testinfra / prepare	43s
run-testinfra / test-ami-nix ("17")	45m 39s
run-testinfra / test-ami-nix ("15")	53m 52s
run-testinfra / test-ami-nix ("orioledb-17")	47m 32s
run-tests / build ("17")	1m 35s
run-tests / build ("15")	1m 46s
run-tests / build ("orioledb-17")	1m 32s
	2h 45m 43s

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