Decouple publish/releasing from main CI (#3483) #2

Job	Run time
test-docs	6m 34s
build-linux / run	3m 26s
build-windows / run	4m 45s
compiler-bridge / run	1m 43s
lint-autofix / run	3m 55s
itest (17, ci/test-mill-bootstrap.sh) / run	9m 0s
itest (11, ci/test-mill-dev.sh && ci/test-mill-release.sh && ./mill -i -k __.ivyDepsTree && ./mil... / run	3m 16s
linux (11, '{scalajslib,scalanativelib}.__.testCached') / run	14m 23s
linux (11, 'example.thirdparty[{mockito,acyclic,commons-io}].local.testCached') / run	4m 12s
linux (11, 'example.{depth,extending}.__.local.testCached') / run	9m 6s
linux (11, 'integration.{failure,feature,ide}.__.local.testCached') / run	10m 41s
linux (17, '{main,scalalib,testrunner,bsp,testkit}.__.testCached') / run	8m 38s
linux (17, 'example.javalib.__.local.testCached') / run	9m 7s
linux (17, 'example.scalalib.__.local.testCached') / run	13m 59s
linux (17, 'example.thirdparty[{fansi,jimfs,netty,gatling}].local.testCached') / run	7m 43s
linux (17, 'integration.invalidation.__.server.testCached') / run	9m 15s
linux (17, 'integration.invalidation.__.fork.testCached') / run	14m 4s
linux (17, contrib.__.testCached) / run	5m 22s
windows (11, contrib.__.testCached) / run	12m 20s
windows (11, 'integration.invalidation[_].server.testCached') / run	11m 38s
windows (11, "example.scalalib.{basic,web}.__.fork.testCached") / run	11m 31s
windows (11, "{main,scalalib,bsp}.__.testCached") / run	12m 36s
windows (17, 'integration.{feature,failure}[_].fork.testCached') / run	11m 49s
	3h 19m 3s

Provide feedback