feat: allow `riscv64` support via custom electron dist #3096

Job	Run time
test-linux (ArtifactPublisherTest,BuildTest,ExtraBuildTest,RepoSlugTest,binDownloadTest,configura...	5m 37s
test-linux (ArtifactPublisherTest,BuildTest,ExtraBuildTest,RepoSlugTest,binDownloadTest,configura...	5m 37s
test-linux (ArtifactPublisherTest,BuildTest,ExtraBuildTest,RepoSlugTest,binDownloadTest,configura...	5m 37s
test-mac	5m 28s
test-mac	5m 28s
test-mac	5m 28s
test-linux (snapTest,debTest,fpmTest,protonTest)	7m 15s
test-linux (snapTest,debTest,fpmTest,protonTest)	7m 15s
test-linux (snapTest,debTest,fpmTest,protonTest)	7m 15s
test-updater	1m 50s
test-updater	1m 50s
test-updater	1m 50s
test-windows (winCodeSignTest,differentialUpdateTest)	3m 45s
test-windows (winCodeSignTest,differentialUpdateTest)	3m 45s
test-windows (winCodeSignTest,differentialUpdateTest)	3m 45s
test-windows (installerTest,appxTest,msiTest,portableTest,assistedInstallerTest,protonTest)	7m 59s
test-windows (installerTest,appxTest,msiTest,portableTest,assistedInstallerTest,protonTest)	7m 25s
test-windows (installerTest,appxTest,msiTest,portableTest,assistedInstallerTest,protonTest)	7m 47s
test-windows (BuildTest,oneClickInstallerTest,winPackagerTest,nsisUpdaterTest,webInstallerTest)	5m 55s
test-windows (BuildTest,oneClickInstallerTest,winPackagerTest,nsisUpdaterTest,webInstallerTest)	5m 55s
test-windows (BuildTest,oneClickInstallerTest,winPackagerTest,nsisUpdaterTest,webInstallerTest)	5m 55s
	1h 52m 41s

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