Reallocate materials when they change. (#17979) #62

Job	Run time
build (windows-latest)	14m 25s
check-bevy-internal-imports	4s
check-doc	11m 43s
build (ubuntu-latest)	7m 44s
check-missing-examples-in-docs	27s
build (macos-latest)	5m 41s
ci	4m 44s
miri	12m 12s
run-examples-macos-metal	4m 26s
toml	1m 57s
typos	10s
check-missing-features-in-docs	32s
markdownlint	1m 4s
check-compiles	9m 42s
check-compiles-no-std	2m 16s
build-wasm-atomics	1m 41s
build-wasm	1m 39s
msrv	1m 48s
	1h 22m 15s

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