default guess imagetype #291

Job	Run time
check-bevy-internal-imports	6s
check-cfg	1m 45s
build (windows-latest)	5m 40s
check-doc	8m 35s
build (ubuntu-latest)	3m 3s
check-missing-examples-in-docs	31s
build (macos-latest)	2m 37s
ci	28s
miri	7m 21s
run-examples-macos-metal	4m 32s
toml	1m 56s
typos	7s
check-compiles	0s
check-missing-features-in-docs	0s
markdownlint	1m 12s
msrv	1m 6s
build-wasm	1m 3s
build-wasm-atomics	1m 31s
	41m 33s

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