CI: Cancel existing builds when PR branch is updated #2066

Job	Run time
Update the docker container if it is modified	3s
clang-18, \| Debug	2h 17m 49s
emcc \| Debug	1h 22m 9s
emcc \| Release	1h 39m 26s
clang-18, \| Release	1h 48m 32s
gcc-13 \| Debug	1h 3m 30s
gcc-13 \| Release	2h 4m 12s
gcc-14 \| Debug	2h 37m 41s
gcc-14 \| Release	5h 1m 10s
	17h 54m 32s

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