Build installers

Only run 'Upload installers' action when pushing to master #184

Sign in to view logs

Run time

Learn about OS pricing on GitHub Actions

Job	Run time
build-osx	1m 26s
build-test-linux	11m 59s
test-osx	9m 28s
build-windows	3m 27s
test-windows	7m 39s
upload-installers	0s
	33m 59s